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-9=6-8m-7m
We move all terms to the left:
-9-(6-8m-7m)=0
We add all the numbers together, and all the variables
-(-15m+6)-9=0
We get rid of parentheses
15m-6-9=0
We add all the numbers together, and all the variables
15m-15=0
We move all terms containing m to the left, all other terms to the right
15m=15
m=15/15
m=1
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