m+3.9=8.1

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Solution for m+3.9=8.1 equation: 



m+3.9=8.1

We move all terms to the left:

m+3.9-(8.1)=0

We add all the numbers together, and all the variables

m-4.2=0

We move all terms containing m to the left, all other terms to the right

m=4.2

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