-126=3(7a+7)

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Solution for -126=3(7a+7) equation: 



-126=3(7a+7)

We move all terms to the left:

-126-(3(7a+7))=0



We calculate terms in parentheses: -(3(7a+7)), so:

3(7a+7)

We multiply parentheses

21a+21

Back to the equation:

-(21a+21)



We get rid of parentheses

-21a-21-126=0

We add all the numbers together, and all the variables

-21a-147=0

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

-21a=147

a=147/-21

a=-7

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