3.9=2.4-0.4y

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Solution for 3.9=2.4-0.4y equation: 



3.9=2.4-0.4y

We move all terms to the left:

3.9-(2.4-0.4y)=0

We add all the numbers together, and all the variables

-(-0.4y+2.4)+3.9=0

We get rid of parentheses

0.4y-2.4+3.9=0

We add all the numbers together, and all the variables

0.4y+1.5=0

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

0.4y=-1.5

y=-1.5/0.4

y=-3+0.3/0.4

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