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-(q-78)=3
We move all terms to the left:
-(q-78)-(3)=0
We get rid of parentheses
-q+78-3=0
We add all the numbers together, and all the variables
-1q+75=0
We move all terms containing q to the left, all other terms to the right
-q=-75
q=-75/-1
q=+75
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