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8+5m=-13+2m
We move all terms to the left:
8+5m-(-13+2m)=0
We add all the numbers together, and all the variables
5m-(2m-13)+8=0
We get rid of parentheses
5m-2m+13+8=0
We add all the numbers together, and all the variables
3m+21=0
We move all terms containing m to the left, all other terms to the right
3m=-21
m=-21/3
m=-7
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