21=2q+5q

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Solution for 21=2q+5q equation: 



21=2q+5q

We move all terms to the left:

21-(2q+5q)=0

We add all the numbers together, and all the variables

-(+7q)+21=0

We get rid of parentheses

-7q+21=0

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

-7q=-21

q=-21/-7

q=+3

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