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-85=15+-4q
We move all terms to the left:
-85-(15+-4q)=0
We add all the numbers together, and all the variables
-(-4q)-85=0
We get rid of parentheses
4q-85=0
We move all terms containing q to the left, all other terms to the right
4q=85
q=85/4
q=21+1/4
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