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14=2m-9m+7
We move all terms to the left:
14-(2m-9m+7)=0
We add all the numbers together, and all the variables
-(-7m+7)+14=0
We get rid of parentheses
7m-7+14=0
We add all the numbers together, and all the variables
7m+7=0
We move all terms containing m to the left, all other terms to the right
7m=-7
m=-7/7
m=-1
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