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9m-4=-15+2m
We move all terms to the left:
9m-4-(-15+2m)=0
We add all the numbers together, and all the variables
9m-(2m-15)-4=0
We get rid of parentheses
9m-2m+15-4=0
We add all the numbers together, and all the variables
7m+11=0
We move all terms containing m to the left, all other terms to the right
7m=-11
m=-11/7
m=-1+4/7
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