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To isolate x we can do one of two things: subtract -8 or add +8. We prefer adding the opposite.

add 8 to each side

simplfy

To check, let's plug -12 in for x.

It works!

Example 2

Solve for y:

This one is a bit trickier. We are going to show you how to do this two different ways:

add (-7) to each side

the negative of y is 3

so

Here is the other way:

add y to each side

add (-10) to each side

so

Now check the answer:

Example 3

Solve for z:

This one is different from the first division example; here the variable is in the denominator. To solve for z, we must first get the variable back on top.