-7(3a-10)=91

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Solution for -7(3a-10)=91 equation: 



-7(3a-10)=91

We move all terms to the left:

-7(3a-10)-(91)=0

We multiply parentheses

-21a+70-91=0

We add all the numbers together, and all the variables

-21a-21=0

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

-21a=21

a=21/-21

a=-1

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