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12=2q+q
We move all terms to the left:
12-(2q+q)=0
We add all the numbers together, and all the variables
-(+3q)+12=0
We get rid of parentheses
-3q+12=0
We move all terms containing q to the left, all other terms to the right
-3q=-12
q=-12/-3
q=+4
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