.50(9.0-y)+.20y=3.90

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Solution for .50(9.0-y)+.20y=3.90 equation: 



.50(9.0-y)+.20y=3.90

We move all terms to the left:

.50(9.0-y)+.20y-(3.90)=0

We add all the numbers together, and all the variables

.50(-1y+9)+.20y-(3.9)=0

We add all the numbers together, and all the variables

.20y+.50(-1y+9)-3.9=0

We multiply parentheses

.20y-0.5y+4.5-3.9=0

We add all the numbers together, and all the variables

-0.3y+0.6=0

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

-0.3y=-0.6

y=-0.6/-0.3

y=+2

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