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