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21=q/6
We move all terms to the left:
21-(q/6)=0
We add all the numbers together, and all the variables
-(+q/6)+21=0
We get rid of parentheses
-q/6+21=0
We multiply all the terms by the denominator
-q+21*6=0
We add all the numbers together, and all the variables
-1q+126=0
We move all terms containing q to the left, all other terms to the right
-q=-126
q=-126/-1
q=+126
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