.20*(.4-y)+.50y=(90*2)

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Solution for .20*(.4-y)+.50y=(90*2) equation:


.20*(.4-y)+.50y=(90*2)

We simplify the equation to the form, which is simple to understand 
.20*(.4-y)+.50y=(90*2)

Simplifying:
.20*(.4-y)+.50y=(+180)

Remove unnecessary parentheses
.20*(.4-y)+.50y=+180

We move all terms containing y to the left and all other terms to the right. 
-1y + 0.5y=+180-0.2-0-0

We simplify left and right side of the equation. 
-0.5y=+179.8

We divide both sides of the equation by -0.5 to get y. 
y=-359.6

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