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20=2q+4
We move all terms to the left:
20-(2q+4)=0
We get rid of parentheses
-2q-4+20=0
We add all the numbers together, and all the variables
-2q+16=0
We move all terms containing q to the left, all other terms to the right
-2q=-16
q=-16/-2
q=+8
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