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 get rid of parentheses

-y-3.9+8.1=0

We add all the numbers together, and all the variables

-1y+4.2=0

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

-y=-4.2

y=-4.2/-1

y=4+0.2/1

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