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3.4+10m=7.87
We move all terms to the left:
3.4+10m-(7.87)=0
We add all the numbers together, and all the variables
10m-4.47=0
We move all terms containing m to the left, all other terms to the right
10m=4.47
m=4.47/10
m=1.8097165991903/4.0485829959514
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