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7m-7m-13m+5m+2=14
We move all terms to the left:
7m-7m-13m+5m+2-(14)=0
We add all the numbers together, and all the variables
-8m-12=0
We move all terms containing m to the left, all other terms to the right
-8m=12
m=12/-8
m=-1+1/2
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