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5m-4=7m+8m
We move all terms to the left:
5m-4-(7m+8m)=0
We add all the numbers together, and all the variables
5m-(+15m)-4=0
We get rid of parentheses
5m-15m-4=0
We add all the numbers together, and all the variables
-10m-4=0
We move all terms containing m to the left, all other terms to the right
-10m=4
m=4/-10
m=-2/5
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