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90+0.7m=60+0.8m
We move all terms to the left:
90+0.7m-(60+0.8m)=0
We add all the numbers together, and all the variables
0.7m-(0.8m+60)+90=0
We get rid of parentheses
0.7m-0.8m-60+90=0
We add all the numbers together, and all the variables
-0.1m+30=0
We move all terms containing m to the left, all other terms to the right
-0.1m=-30
m=-30/-0.1
m=+300
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