-7(a-1)=-77

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Solution for -7(a-1)=-77 equation: 



-7(a-1)=-77

We move all terms to the left:

-7(a-1)-(-77)=0

We add all the numbers together, and all the variables

-7(a-1)+77=0

We multiply parentheses

-7a+7+77=0

We add all the numbers together, and all the variables

-7a+84=0

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

-7a=-84

a=-84/-7

a=+12

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