-12=4(a-1)

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



-12=4(a-1)

We move all terms to the left:

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



We calculate terms in parentheses: -(4(a-1)), so:

4(a-1)

We multiply parentheses

4a-4

Back to the equation:

-(4a-4)



We get rid of parentheses

-4a+4-12=0

We add all the numbers together, and all the variables

-4a-8=0

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

-4a=8

a=8/-4

a=-2

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