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