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12+15m=-13+10m
We move all terms to the left:
12+15m-(-13+10m)=0
We add all the numbers together, and all the variables
15m-(10m-13)+12=0
We get rid of parentheses
15m-10m+13+12=0
We add all the numbers together, and all the variables
5m+25=0
We move all terms containing m to the left, all other terms to the right
5m=-25
m=-25/5
m=-5
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