12=-2(a+4)

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Solution for 12=-2(a+4) equation: 



12=-2(a+4)

We move all terms to the left:

12-(-2(a+4))=0



We calculate terms in parentheses: -(-2(a+4)), so:

-2(a+4)

We multiply parentheses

-2a-8

Back to the equation:

-(-2a-8)



We get rid of parentheses

2a+8+12=0

We add all the numbers together, and all the variables

2a+20=0

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

2a=-20

a=-20/2

a=-10

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