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D( y )
y-6 = 0
4*y-24 = 0
y-6 = 0
y-6 = 0
y-6 = 0 // + 6
y = 6
4*y-24 = 0
4*y-24 = 0
4*y-24 = 0 // + 24
4*y = 24 // : 4
y = 24/4
y = 6
y in (-oo:6) U (6:+oo)
7/(y-6) = 5/(4*y-24)-2 // - 5/(4*y-24)-2
7/(y-6)-(5/(4*y-24))+2 = 0
7/(y-6)-5*(4*y-24)^-1+2 = 0
7/(y-6)-5/(4*y-24)+2 = 0
(7*(4*y-24))/((y-6)*(4*y-24))+(-5*(y-6))/((y-6)*(4*y-24))+(2*(y-6)*(4*y-24))/((y-6)*(4*y-24)) = 0
7*(4*y-24)-5*(y-6)+2*(y-6)*(4*y-24) = 0
8*y^2+23*y-96*y-138+288 = 0
8*y^2-73*y+150 = 0
8*y^2-73*y+150 = 0
8*y^2-73*y+150 = 0
DELTA = (-73)^2-(4*8*150)
DELTA = 529
DELTA > 0
y = (529^(1/2)+73)/(2*8) or y = (73-529^(1/2))/(2*8)
y = 6 or y = 25/8
(y-25/8)*(y-6) = 0
((y-25/8)*(y-6))/((y-6)*(4*y-24)) = 0
((y-25/8)*(y-6))/((y-6)*(4*y-24)) = 0 // * (y-6)*(4*y-24)
(y-25/8)*(y-6) = 0
( y-25/8 )
y-25/8 = 0 // + 25/8
y = 25/8
( y-6 )
y-6 = 0 // + 6
y = 6
y in { 6}
y = 25/8
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