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20=4q+12
We move all terms to the left:
20-(4q+12)=0
We get rid of parentheses
-4q-12+20=0
We add all the numbers together, and all the variables
-4q+8=0
We move all terms containing q to the left, all other terms to the right
-4q=-8
q=-8/-4
q=+2
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