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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(6*x^2-(4*x)-10)/(3*x-5) = 0
(6*x^2-4*x-10)/(3*x-5) = 0
6*x^2-4*x-10 = 0
2*(3*x^2-2*x-5) = 0
3*x^2-2*x-5 = 0
DELTA = (-2)^2-(-5*3*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+2)/(2*3) or x = (2-64^(1/2))/(2*3)
x = 5/3 or x = -1
2*(x+1)*(x-5/3) = 0
(2*(x+1)*(x-5/3))/(3*x-5) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-5/3 )
x-5/3 = 0 // + 5/3
x = 5/3
x in { 5/3}
x = -1
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