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-17m+20=-17m-19-13m
We move all terms to the left:
-17m+20-(-17m-19-13m)=0
We add all the numbers together, and all the variables
-17m-(-30m-19)+20=0
We get rid of parentheses
-17m+30m+19+20=0
We add all the numbers together, and all the variables
13m+39=0
We move all terms containing m to the left, all other terms to the right
13m=-39
m=-39/13
m=-3
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