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16+17m=2m+21
We move all terms to the left:
16+17m-(2m+21)=0
We get rid of parentheses
17m-2m-21+16=0
We add all the numbers together, and all the variables
15m-5=0
We move all terms containing m to the left, all other terms to the right
15m=5
m=5/15
m=1/3
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