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100+0.3m=60+0.7m
We move all terms to the left:
100+0.3m-(60+0.7m)=0
We add all the numbers together, and all the variables
0.3m-(0.7m+60)+100=0
We get rid of parentheses
0.3m-0.7m-60+100=0
We add all the numbers together, and all the variables
-0.4m+40=0
We move all terms containing m to the left, all other terms to the right
-0.4m=-40
m=-40/-0.4
m=+100
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