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-12m+4m-5-9=8m-13m+15-9
We move all terms to the left:
-12m+4m-5-9-(8m-13m+15-9)=0
We add all the numbers together, and all the variables
-12m+4m-(-5m+6)-5-9=0
We add all the numbers together, and all the variables
-8m-(-5m+6)-14=0
We get rid of parentheses
-8m+5m-6-14=0
We add all the numbers together, and all the variables
-3m-20=0
We move all terms containing m to the left, all other terms to the right
-3m=20
m=20/-3
m=-6+2/3
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