91=21+7q

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Solution for 91=21+7q equation: 



91=21+7q

We move all terms to the left:

91-(21+7q)=0

We add all the numbers together, and all the variables

-(7q+21)+91=0

We get rid of parentheses

-7q-21+91=0

We add all the numbers together, and all the variables

-7q+70=0

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

-7q=-70

q=-70/-7

q=+10

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