8.1+y=3.9

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Solution for 8.1+y=3.9 equation: 



8.1+y=3.9

We move all terms to the left:

8.1+y-(3.9)=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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