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33=20+m
We move all terms to the left:
33-(20+m)=0
We add all the numbers together, and all the variables
-(m+20)+33=0
We get rid of parentheses
-m-20+33=0
We add all the numbers together, and all the variables
-1m+13=0
We move all terms containing m to the left, all other terms to the right
-m=-13
m=-13/-1
m=+13
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