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42=7+5q
We move all terms to the left:
42-(7+5q)=0
We add all the numbers together, and all the variables
-(5q+7)+42=0
We get rid of parentheses
-5q-7+42=0
We add all the numbers together, and all the variables
-5q+35=0
We move all terms containing q to the left, all other terms to the right
-5q=-35
q=-35/-5
q=+7
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