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39=66-q
We move all terms to the left:
39-(66-q)=0
We add all the numbers together, and all the variables
-(-1q+66)+39=0
We get rid of parentheses
1q-66+39=0
We add all the numbers together, and all the variables
q-27=0
We move all terms containing q to the left, all other terms to the right
q=27
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