-91=-7(a+6)

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Solution for -91=-7(a+6) equation: 



-91=-7(a+6)

We move all terms to the left:

-91-(-7(a+6))=0



We calculate terms in parentheses: -(-7(a+6)), so:

-7(a+6)

We multiply parentheses

-7a-42

Back to the equation:

-(-7a-42)



We get rid of parentheses

7a+42-91=0

We add all the numbers together, and all the variables

7a-49=0

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

7a=49

a=49/7

a=7

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