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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+(6/3)*x+4*x-(6/x)-10+1 = 0
4*x+(6/3)*x+4*x-6*x^-1-10+1 = 0
10*x^1-6*x^-1-9*x^0 = 0
(10*x^2-9*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^2-9*x^1-6*x^0) = 0
x^1
10*x^2-9*x-6 = 0
10*x^2-9*x-6 = 0
DELTA = (-9)^2-(-6*4*10)
DELTA = 321
DELTA > 0
x = (321^(1/2)+9)/(2*10) or x = (9-321^(1/2))/(2*10)
x = (321^(1/2)+9)/20 or x = (9-321^(1/2))/20
x in { (9-321^(1/2))/20, (321^(1/2)+9)/20}
x in { (9-321^(1/2))/20, (321^(1/2)+9)/20 }
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