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5m-7m=-12+2
We move all terms to the left:
5m-7m-(-12+2)=0
We add all the numbers together, and all the variables
5m-7m-(-10)=0
We add all the numbers together, and all the variables
-2m+10=0
We move all terms containing m to the left, all other terms to the right
-2m=-10
m=-10/-2
m=+5
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