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12m-9=10m+5
We move all terms to the left:
12m-9-(10m+5)=0
We get rid of parentheses
12m-10m-5-9=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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