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.5(9-y)+.2y=4.05
We simplify the equation to the form, which is simple to understand
.5(9-y)+.2y=4.05
Reorder the terms in parentheses
+(+4.5-0.5y)+.2y=4.05
Remove unnecessary parentheses
+4.5-0.5y+.2y=+4.05
We move all terms containing y to the left and all other terms to the right.
-0.5y + 0.2y=+4.05-4.5
We simplify left and right side of the equation.
-0.3y=-0.45
We divide both sides of the equation by -0.3 to get y.
y=1.5
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