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42=4q+2
We move all terms to the left:
42-(4q+2)=0
We get rid of parentheses
-4q-2+42=0
We add all the numbers together, and all the variables
-4q+40=0
We move all terms containing q to the left, all other terms to the right
-4q=-40
q=-40/-4
q=+10
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