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85=m/7+79
We move all terms to the left:
85-(m/7+79)=0
We get rid of parentheses
-m/7-79+85=0
We multiply all the terms by the denominator
-m-79*7+85*7=0
We add all the numbers together, and all the variables
-1m+42=0
We move all terms containing m to the left, all other terms to the right
-m=-42
m=-42/-1
m=+42
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