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3.9+10m=6.21
We move all terms to the left:
3.9+10m-(6.21)=0
We add all the numbers together, and all the variables
10m-2.31=0
We move all terms containing m to the left, all other terms to the right
10m=2.31
m=2.31/10
m=1/4.3290043290043
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