.20*(.40-y)+50=(90*2)

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Solution for .20*(.40-y)+50=(90*2) equation:


.20*(.40-y)+50=(90*2)

We simplify the equation to the form, which is simple to understand 
.20*(.40-y)+50=(90*2)

Simplifying:
.20*(.40-y)+50=(+180)

Remove unnecessary parentheses
.20*(.40-y)+50=+180

We move all terms containing y to the left and all other terms to the right. 
-1y=+180-0.2-0-0-50

We simplify left and right side of the equation. 
-1y=+129.8

We divide both sides of the equation by -1 to get y. 
y=-129.8

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