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13=12+q/4
We move all terms to the left:
13-(12+q/4)=0
We add all the numbers together, and all the variables
-(q/4+12)+13=0
We get rid of parentheses
-q/4-12+13=0
We multiply all the terms by the denominator
-q-12*4+13*4=0
We add all the numbers together, and all the variables
-1q+4=0
We move all terms containing q to the left, all other terms to the right
-q=-4
q=-4/-1
q=+4
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