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120+0.70m=80+0.80m
We move all terms to the left:
120+0.70m-(80+0.80m)=0
We add all the numbers together, and all the variables
0.70m-(0.80m+80)+120=0
We get rid of parentheses
0.70m-0.80m-80+120=0
We add all the numbers together, and all the variables
-0.1m+40=0
We move all terms containing m to the left, all other terms to the right
-0.1m=-40
m=-40/-0.1
m=+400
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