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-7-18m=-20m+13
We move all terms to the left:
-7-18m-(-20m+13)=0
We get rid of parentheses
-18m+20m-13-7=0
We add all the numbers together, and all the variables
2m-20=0
We move all terms containing m to the left, all other terms to the right
2m=20
m=20/2
m=10
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