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