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D( y )
2*y-10 = 0
y-5 = 0
2*y-10 = 0
2*y-10 = 0
2*y-10 = 0 // + 10
2*y = 10 // : 2
y = 10/2
y = 5
y-5 = 0
y-5 = 0
y-5 = 0 // + 5
y = 5
y in (-oo:5) U (5:+oo)
4-3/(2*y-10) = -5/(y-5) // + -5/(y-5)
4-3/(2*y-10)-(-5/(y-5)) = 0
5*(y-5)^-1-3/(2*y-10)+4 = 0
5/(y-5)-3/(2*y-10)+4 = 0
(-3*(y-5))/((2*y-10)*(y-5))+(5*(2*y-10))/((2*y-10)*(y-5))+(4*(2*y-10)*(y-5))/((2*y-10)*(y-5)) = 0
5*(2*y-10)-3*(y-5)+4*(2*y-10)*(y-5) = 0
8*y^2+7*y-80*y-35+200 = 0
8*y^2-73*y+165 = 0
8*y^2-73*y+165 = 0
8*y^2-73*y+165 = 0
DELTA = (-73)^2-(4*8*165)
DELTA = 49
DELTA > 0
y = (49^(1/2)+73)/(2*8) or y = (73-49^(1/2))/(2*8)
y = 5 or y = 33/8
(y-33/8)*(y-5) = 0
((y-33/8)*(y-5))/((2*y-10)*(y-5)) = 0
((y-33/8)*(y-5))/((2*y-10)*(y-5)) = 0 // * (2*y-10)*(y-5)
(y-33/8)*(y-5) = 0
( y-33/8 )
y-33/8 = 0 // + 33/8
y = 33/8
( y-5 )
y-5 = 0 // + 5
y = 5
y in { 5}
y = 33/8
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