2a-4(7+a)=12

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Solution for 2a-4(7+a)=12 equation: 



2a-4(7+a)=12

We move all terms to the left:

2a-4(7+a)-(12)=0

We add all the numbers together, and all the variables

2a-4(a+7)-12=0

We multiply parentheses

2a-4a-28-12=0

We add all the numbers together, and all the variables

-2a-40=0

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

-2a=40

a=40/-2

a=-20

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