4(-a-1)=12

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Solution for 4(-a-1)=12 equation: 



4(-a-1)=12

We move all terms to the left:

4(-a-1)-(12)=0

We add all the numbers together, and all the variables

4(-1a-1)-12=0

We multiply parentheses

-4a-4-12=0

We add all the numbers together, and all the variables

-4a-16=0

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

-4a=16

a=16/-4

a=-4

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