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40+0.40m=20+0.80m
We move all terms to the left:
40+0.40m-(20+0.80m)=0
We add all the numbers together, and all the variables
0.40m-(0.80m+20)+40=0
We get rid of parentheses
0.40m-0.80m-20+40=0
We add all the numbers together, and all the variables
-0.4m+20=0
We move all terms containing m to the left, all other terms to the right
-0.4m=-20
m=-20/-0.4
m=+50
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