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-7+4m=8+4m+5m
We move all terms to the left:
-7+4m-(8+4m+5m)=0
We add all the numbers together, and all the variables
4m-(9m+8)-7=0
We get rid of parentheses
4m-9m-8-7=0
We add all the numbers together, and all the variables
-5m-15=0
We move all terms containing m to the left, all other terms to the right
-5m=15
m=15/-5
m=-3
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