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6m-17=8m-21
We move all terms to the left:
6m-17-(8m-21)=0
We get rid of parentheses
6m-8m+21-17=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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