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45+0.2m=40+0.3m
We move all terms to the left:
45+0.2m-(40+0.3m)=0
We add all the numbers together, and all the variables
0.2m-(0.3m+40)+45=0
We get rid of parentheses
0.2m-0.3m-40+45=0
We add all the numbers together, and all the variables
-0.1m+5=0
We move all terms containing m to the left, all other terms to the right
-0.1m=-5
m=-5/-0.1
m=+50
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