y+3.9=8.1

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Solution for y+3.9=8.1 equation: 



y+3.9=8.1

We move all terms to the left:

y+3.9-(8.1)=0

We add all the numbers together, and all the variables

y-4.2=0

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

y=4.2

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