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15+-13=-13m-20m
We move all terms to the left:
15+-13-(-13m-20m)=0
We add all the numbers together, and all the variables
-(-33m)+15-13+=0
We add all the numbers together, and all the variables
-(-33m)=0
We get rid of parentheses
33m=0
m=0/33
m=0
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