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3m-4+2m-3=3m-21
We move all terms to the left:
3m-4+2m-3-(3m-21)=0
We add all the numbers together, and all the variables
5m-(3m-21)-7=0
We get rid of parentheses
5m-3m+21-7=0
We add all the numbers together, and all the variables
2m+14=0
We move all terms containing m to the left, all other terms to the right
2m=-14
m=-14/2
m=-7
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