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4m-12=15-5m
We move all terms to the left:
4m-12-(15-5m)=0
We add all the numbers together, and all the variables
4m-(-5m+15)-12=0
We get rid of parentheses
4m+5m-15-12=0
We add all the numbers together, and all the variables
9m-27=0
We move all terms containing m to the left, all other terms to the right
9m=27
m=27/9
m=3
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