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3m-4=m-13
We move all terms to the left:
3m-4-(m-13)=0
We get rid of parentheses
3m-m+13-4=0
We add all the numbers together, and all the variables
2m+9=0
We move all terms containing m to the left, all other terms to the right
2m=-9
m=-9/2
m=-4+1/2
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