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7m-2m+3=-2m-18
We move all terms to the left:
7m-2m+3-(-2m-18)=0
We add all the numbers together, and all the variables
5m-(-2m-18)+3=0
We get rid of parentheses
5m+2m+18+3=0
We add all the numbers together, and all the variables
7m+21=0
We move all terms containing m to the left, all other terms to the right
7m=-21
m=-21/7
m=-3
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