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40=17.2+m
We move all terms to the left:
40-(17.2+m)=0
We add all the numbers together, and all the variables
-(m+17.2)+40=0
We get rid of parentheses
-m-17.2+40=0
We add all the numbers together, and all the variables
-1m+22.8=0
We move all terms containing m to the left, all other terms to the right
-m=-22.8
m=-22.8/-1
m=22+0.8/1
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