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D( x )
4*x^3-(5*x^2) = 0
2*x-12 = 0
4*x^3-(5*x^2) = 0
4*x^3-(5*x^2) = 0
4*x^3-5*x^2 = 0
4*x^3-5*x^2 = 0
x^2*(4*x-5) = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
2*x-12 = 0
2*x-12 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x in (-oo:0) U (0:5/4) U (5/4:6) U (6:+oo)
((x^2-(2*x)-24)/(4*x^3-(5*x^2)))*((x^3-x^2)/(2*x-12)) = 0
((x^2-2*x-24)/(4*x^3-5*x^2))*((x^3-x^2)/(2*x-12)) = 0
((x^2-2*x-24)*(x^3-x^2))/((4*x^3-5*x^2)*(2*x-12)) = 0
x^2-2*x-24 = 0
x^2-2*x-24 = 0
DELTA = (-2)^2-(-24*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+2)/(1*2) or x = (2-100^(1/2))/(1*2)
x = 6 or x = -4
(x+4)*(x-6) = 0
4*x^3-5*x^2 = 0
x^2*(4*x-5) = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x^2*(x-5/4) = 0
x^3-x^2 = 0
x^2*(x-1) = 0
x-1 = 0 // + 1
x = 1
x^2*(x-1) = 0
(x^2*(x+4)*(x-6)*(x-1))/(x^2*(x-5/4)*(2*x-12)) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-1 )
x-1 = 0 // + 1
x = 1
( x-6 )
x-6 = 0 // + 6
x = 6
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 6}
x in { 0}
x in { -4, 1 }
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