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15+2m=2m+9+m
We move all terms to the left:
15+2m-(2m+9+m)=0
We add all the numbers together, and all the variables
2m-(3m+9)+15=0
We get rid of parentheses
2m-3m-9+15=0
We add all the numbers together, and all the variables
-1m+6=0
We move all terms containing m to the left, all other terms to the right
-m=-6
m=-6/-1
m=+6
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