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2.5+10m=6.86
We move all terms to the left:
2.5+10m-(6.86)=0
We add all the numbers together, and all the variables
10m-4.36=0
We move all terms containing m to the left, all other terms to the right
10m=4.36
m=4.36/10
m=1.8474576271186/4.2372881355932
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