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-20m+9m+13m-(-11m)+5m=-18
We move all terms to the left:
-20m+9m+13m-(-11m)+5m-(-18)=0
We add all the numbers together, and all the variables
7m-(-11m)+18=0
We get rid of parentheses
7m+11m+18=0
We add all the numbers together, and all the variables
18m+18=0
We move all terms containing m to the left, all other terms to the right
18m=-18
m=-18/18
m=-1
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