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y in (-oo:+oo)
(-8/5)*(1/10)*y*(y-15) = 0
-4/25*y*(y-15) = 0
( -4/25*y )
-4/25*y = 0 // : -4/25
y = 0
( y-15 )
y-15 = 0 // + 15
y = 15
y in { 0, 15 }
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