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17-9m=-7m+9
We move all terms to the left:
17-9m-(-7m+9)=0
We get rid of parentheses
-9m+7m-9+17=0
We add all the numbers together, and all the variables
-2m+8=0
We move all terms containing m to the left, all other terms to the right
-2m=-8
m=-8/-2
m=+4
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