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160+0.80m=80+0.90m
We move all terms to the left:
160+0.80m-(80+0.90m)=0
We add all the numbers together, and all the variables
0.80m-(0.90m+80)+160=0
We get rid of parentheses
0.80m-0.90m-80+160=0
We add all the numbers together, and all the variables
-0.1m+80=0
We move all terms containing m to the left, all other terms to the right
-0.1m=-80
m=-80/-0.1
m=+800
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