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-5-9+4m=8m-13m+15-8
We move all terms to the left:
-5-9+4m-(8m-13m+15-8)=0
We add all the numbers together, and all the variables
4m-(-5m+7)-5-9=0
We add all the numbers together, and all the variables
4m-(-5m+7)-14=0
We get rid of parentheses
4m+5m-7-14=0
We add all the numbers together, and all the variables
9m-21=0
We move all terms containing m to the left, all other terms to the right
9m=21
m=21/9
m=2+1/3
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