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-42=10q+4q
We move all terms to the left:
-42-(10q+4q)=0
We add all the numbers together, and all the variables
-(+14q)-42=0
We get rid of parentheses
-14q-42=0
We move all terms containing q to the left, all other terms to the right
-14q=42
q=42/-14
q=-3
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