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D( y )
3*y-4 = 0
3*y-4 = 0
3*y-4 = 0
3*y-4 = 0 // + 4
3*y = 4 // : 3
y = 4/3
y in (-oo:4/3) U (4/3:+oo)
(6*y^2-(35*y)+36)/(3*y-4) = 0
(6*y^2-35*y+36)/(3*y-4) = 0
6*y^2-35*y+36 = 0
6*y^2-35*y+36 = 0
DELTA = (-35)^2-(4*6*36)
DELTA = 361
DELTA > 0
y = (361^(1/2)+35)/(2*6) or y = (35-361^(1/2))/(2*6)
y = 9/2 or y = 4/3
(y-4/3)*(y-9/2) = 0
((y-4/3)*(y-9/2))/(3*y-4) = 0
( y-4/3 )
y-4/3 = 0 // + 4/3
y = 4/3
( y-9/2 )
y-9/2 = 0 // + 9/2
y = 9/2
y in { 4/3}
y = 9/2
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