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D( y )
2*y-10 = 0
2*y-10 = 0
2*y-10 = 0
2*y-10 = 0 // + 10
2*y = 10 // : 2
y = 10/2
y = 5
y in (-oo:5) U (5:+oo)
(y^2-(5*y))/(2*y-10) = 0
(y^2-5*y)/(2*y-10) = 0
y^2-5*y = 0
y*(y-5) = 0
y-5 = 0 // + 5
y = 5
y*(y-5) = 0
(y*(y-5))/(2*y-10) = 0
( y-5 )
y-5 = 0 // + 5
y = 5
( y )
y = 0
y in { 5}
y = 0
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