-2(a-7)=90

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Solution for -2(a-7)=90 equation: 



-2(a-7)=90

We move all terms to the left:

-2(a-7)-(90)=0

We multiply parentheses

-2a+14-90=0

We add all the numbers together, and all the variables

-2a-76=0

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

-2a=76

a=76/-2

a=-38

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