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