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13m-12=17m+8
We move all terms to the left:
13m-12-(17m+8)=0
We get rid of parentheses
13m-17m-8-12=0
We add all the numbers together, and all the variables
-4m-20=0
We move all terms containing m to the left, all other terms to the right
-4m=20
m=20/-4
m=-5
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