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3.9+10m=8.15
We move all terms to the left:
3.9+10m-(8.15)=0
We add all the numbers together, and all the variables
10m-4.25=0
We move all terms containing m to the left, all other terms to the right
10m=4.25
m=4.25/10
m=1.8888888888889/4.4444444444444
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