-3.9=2.1-3y

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Solution for -3.9=2.1-3y equation: 



-3.9=2.1-3y

We move all terms to the left:

-3.9-(2.1-3y)=0

We add all the numbers together, and all the variables

-(-3y+2.1)-3.9=0

We get rid of parentheses

3y-2.1-3.9=0

We add all the numbers together, and all the variables

3y-6=0

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

3y=6

y=6/3

y=2

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