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9+8m=10m-9
We move all terms to the left:
9+8m-(10m-9)=0
We get rid of parentheses
8m-10m+9+9=0
We add all the numbers together, and all the variables
-2m+18=0
We move all terms containing m to the left, all other terms to the right
-2m=-18
m=-18/-2
m=+9
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