91=12a+a

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Solution for 91=12a+a equation: 



91=12a+a

We move all terms to the left:

91-(12a+a)=0

We add all the numbers together, and all the variables

-(+13a)+91=0

We get rid of parentheses

-13a+91=0

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

-13a=-91

a=-91/-13

a=+7

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