-2.1=3.9-2y

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Solution for -2.1=3.9-2y equation: 



-2.1=3.9-2y

We move all terms to the left:

-2.1-(3.9-2y)=0

We add all the numbers together, and all the variables

-(-2y+3.9)-2.1=0

We get rid of parentheses

2y-3.9-2.1=0

We add all the numbers together, and all the variables

2y-6=0

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

2y=6

y=6/2

y=3

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