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