91=-21a+7

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Solution for 91=-21a+7 equation: 



91=-21a+7

We move all terms to the left:

91-(-21a+7)=0

We get rid of parentheses

21a-7+91=0

We add all the numbers together, and all the variables

21a+84=0

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

21a=-84

a=-84/21

a=-4

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