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3=q-12/4
We move all terms to the left:
3-(q-12/4)=0
We add all the numbers together, and all the variables
-(q-3)+3=0
We get rid of parentheses
-q+3+3=0
We add all the numbers together, and all the variables
-1q+6=0
We move all terms containing q to the left, all other terms to the right
-q=-6
q=-6/-1
q=+6
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