12=(-7x)-9

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Solution for 12=(-7x)-9 equation: 



12=(-7x)-9

We move all terms to the left:

12-((-7x)-9)=0



We calculate terms in parentheses: -((-7x)-9), so:

(-7x)-9

We get rid of parentheses

-7x-9

Back to the equation:

-(-7x-9)



We get rid of parentheses

7x+9+12=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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