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18-m/20=-9
We move all terms to the left:
18-m/20-(-9)=0
We add all the numbers together, and all the variables
-m/20+27=0
We multiply all the terms by the denominator
-m+27*20=0
We add all the numbers together, and all the variables
-1m+540=0
We move all terms containing m to the left, all other terms to the right
-m=-540
m=-540/-1
m=+540
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