12=-4(a+7)

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Solution for 12=-4(a+7) equation: 



12=-4(a+7)

We move all terms to the left:

12-(-4(a+7))=0



We calculate terms in parentheses: -(-4(a+7)), so:

-4(a+7)

We multiply parentheses

-4a-28

Back to the equation:

-(-4a-28)



We get rid of parentheses

4a+28+12=0

We add all the numbers together, and all the variables

4a+40=0

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

4a=-40

a=-40/4

a=-10

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