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.20*(90-y)+.50y=(90*.4)
We simplify the equation to the form, which is simple to understand
.20*(90-y)+.50y=(90*.4)
Simplifying:
.20*(90-y)+.50y=(+36)
Reorder the terms in parentheses
+(+18-0.2y)+.50y=(+36)
Remove unnecessary parentheses
+18-0.2y+.50y=+(+36+)
Remove unnecessary parentheses
+18-0.2y+.50y=+36
We move all terms containing y to the left and all other terms to the right.
-0.2y + 0.5y=+36-18
We simplify left and right side of the equation.
+ 0.3y=+18
We divide both sides of the equation by 0.3 to get y.
y=60
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