3.9=1.2-0.5y

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Solution for 3.9=1.2-0.5y equation: 



3.9=1.2-0.5y

We move all terms to the left:

3.9-(1.2-0.5y)=0

We add all the numbers together, and all the variables

-(-0.5y+1.2)+3.9=0

We get rid of parentheses

0.5y-1.2+3.9=0

We add all the numbers together, and all the variables

0.5y+2.7=0

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

0.5y=-2.7

y=-2.7/0.5

y=-5+0.2/0.5

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