7x-(-2x)=-18

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Solution for 7x-(-2x)=-18 equation: 



7x-(-2x)=-18

We move all terms to the left:

7x-(-2x)-(-18)=0

We add all the numbers together, and all the variables

7x-(-2x)+18=0

We get rid of parentheses

7x+2x+18=0

We add all the numbers together, and all the variables

9x+18=0

We move all terms containing x to the left, all other terms to the right

9x=-18

x=-18/9

x=-2

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