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-78+3m-8m+9=-9m-7+14m-2
We move all terms to the left:
-78+3m-8m+9-(-9m-7+14m-2)=0
We add all the numbers together, and all the variables
3m-8m-(5m-9)-78+9=0
We add all the numbers together, and all the variables
-5m-(5m-9)-69=0
We get rid of parentheses
-5m-5m+9-69=0
We add all the numbers together, and all the variables
-10m-60=0
We move all terms containing m to the left, all other terms to the right
-10m=60
m=60/-10
m=-6
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