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-31=-7m-3
We move all terms to the left:
-31-(-7m-3)=0
We get rid of parentheses
7m+3-31=0
We add all the numbers together, and all the variables
7m-28=0
We move all terms containing m to the left, all other terms to the right
7m=28
m=28/7
m=4
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