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31.5+0.12m=-18.9+0.33m
We move all terms to the left:
31.5+0.12m-(-18.9+0.33m)=0
We add all the numbers together, and all the variables
0.12m-(0.33m-18.9)+31.5=0
We get rid of parentheses
0.12m-0.33m+18.9+31.5=0
We add all the numbers together, and all the variables
-0.21m+50.4=0
We move all terms containing m to the left, all other terms to the right
-0.21m=-50.4
m=-50.4/-0.21
m=+240
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