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189=18m+9
We move all terms to the left:
189-(18m+9)=0
We get rid of parentheses
-18m-9+189=0
We add all the numbers together, and all the variables
-18m+180=0
We move all terms containing m to the left, all other terms to the right
-18m=-180
m=-180/-18
m=+10
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