3.9=2.5-0.4y

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Solution for 3.9=2.5-0.4y equation: 



3.9=2.5-0.4y

We move all terms to the left:

3.9-(2.5-0.4y)=0

We add all the numbers together, and all the variables

-(-0.4y+2.5)+3.9=0

We get rid of parentheses

0.4y-2.5+3.9=0

We add all the numbers together, and all the variables

0.4y+1.4=0

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

0.4y=-1.4

y=-1.4/0.4

y=-3+0.2/0.4

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