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1=9-4/5(y-15)
We simplify the equation to the form, which is simple to understand
1=9-4/5(y-15)
Reorder the terms in parentheses
1=9+(-0.8y+12)
Remove unnecessary parentheses
+1=+9-0.8y+12
We move all terms containing y to the left and all other terms to the right.
+ 0.8y=+9+12-1
We simplify left and right side of the equation.
+ 0.8y=+20
We divide both sides of the equation by 00.8 to get y.
y=25
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