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Solve for x:

Let's first get rid of the 7, since it's not attached to the variable.

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

- 12 = -12

It works!

Solve for y:

Here we can isolate the variable by first getting rid of the 1:

Remember to check it!

In this problem, we would first get rid of the 2, since it's not as attached to the variable as the 5:

And check: