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30+0.70m=90+0.50m
We move all terms to the left:
30+0.70m-(90+0.50m)=0
We add all the numbers together, and all the variables
0.70m-(0.50m+90)+30=0
We get rid of parentheses
0.70m-0.50m-90+30=0
We add all the numbers together, and all the variables
0.2m-60=0
We move all terms containing m to the left, all other terms to the right
0.2m=60
m=60/0.2
m=300
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