The Substitution Property of Equality tells me that if , then wherever I could write , I may instead substitute  (and vice versa)! This rule underpins most mathematics.

Therefore, if , the Substitution Property of Equality lets me say that ---> .

This is a one-step equation where you need to divide both sides by  to get  by itself. 

So,  when you simplify this you get

In order to solve for , we will need to multiply both sides by .  

Simplify the left and right sides of the equation.

The answer is:  

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Subtract  from both sides of the equation.

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Subtract  from both sides of the equation.

Remember since  is greater than  and is negative, our answer is negative. We will treat the operation as a normal subtraction problem.

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Subtract  from both sides of the equation.

When subtracting a number from a negative number, we will treat the operation as addition and place a negative sign in front of the answer. 

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Add  to both sides of the equation.

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Add  to both sides of the equation.

Remember since  is greater than  and is positive, our answer is positive. We will treat the operation as a normal subtraction problem.

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Add  to both sides of the equation.

Remember since  is greater than  and is negative, our answer is negative. We will treat the operation as a normal subtraction problem.

Solve.

In order to solve for , we need to isolate the variable on the left side of the equation.  We will do this by performing the reverse operations that were done on the variable to both sides of the equation.

Divide both sides of the eqaution by .

Solve.