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-12m-5-9+4m=8m-13=+15-8
We move all terms to the left:
-12m-5-9+4m-(8m-13)=0
We add all the numbers together, and all the variables
-8m-(8m-13)-14=0
We get rid of parentheses
-8m-8m+13-14=0
We add all the numbers together, and all the variables
-16m-1=0
We move all terms containing m to the left, all other terms to the right
-16m=1
m=1/-16
m=-1/16
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