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100+0.60m=40+0.90m
We move all terms to the left:
100+0.60m-(40+0.90m)=0
We add all the numbers together, and all the variables
0.60m-(0.90m+40)+100=0
We get rid of parentheses
0.60m-0.90m-40+100=0
We add all the numbers together, and all the variables
-0.3m+60=0
We move all terms containing m to the left, all other terms to the right
-0.3m=-60
m=-60/-0.3
m=+200
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