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D( x )
15*x^2 = 0
x^2-(5*x)-6 = 0
15*x^2 = 0
15*x^2 = 0
15*x^2 = 0 // : 15
x^2 = 0
x = 0
x^2-(5*x)-6 = 0
x^2-(5*x)-6 = 0
x^2-5*x-6 = 0
x^2-5*x-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(1*2) or x = (5-49^(1/2))/(1*2)
x = 6 or x = -1
x in (-oo:-1) U (-1:0) U (0:6) U (6:+oo)
(5*x*((x^2-1)/(15*x^2)))/(x^2-(5*x)-6) = 0
(5*x*((x^2-1)/(15*x^2)))/(x^2-5*x-6) = 0
(5*x*(x^2-1))/(15*x^2*(x^2-5*x-6)) = 0
x^2-5*x-6 = 0
x^2-5*x-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(1*2) or x = (5-49^(1/2))/(1*2)
x = 6 or x = -1
(x+1)*(x-6) = 0
(5*x*(x^2-1))/(15*x^2*(x+1)*(x-6)) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x^2-1 )
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 0}
x in { -1}
x = 1
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