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15=-25+2m
We move all terms to the left:
15-(-25+2m)=0
We add all the numbers together, and all the variables
-(2m-25)+15=0
We get rid of parentheses
-2m+25+15=0
We add all the numbers together, and all the variables
-2m+40=0
We move all terms containing m to the left, all other terms to the right
-2m=-40
m=-40/-2
m=+20
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