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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(3/x)-10-2 = 6/x-(10*x)-2 // - 6/x-(10*x)-2
10*x+2/x-(3/x)-(6/x)-10-2+2 = 0
10*x+2/x-3*x^-1-6*x^-1-10-2+2 = 0
10*x^1-7*x^-1-10*x^0 = 0
(10*x^2-10*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^2-10*x^1-7*x^0) = 0
x^1
10*x^2-10*x-7 = 0
10*x^2-10*x-7 = 0
DELTA = (-10)^2-(-7*4*10)
DELTA = 380
DELTA > 0
x = (380^(1/2)+10)/(2*10) or x = (10-380^(1/2))/(2*10)
x = (2*95^(1/2)+10)/20 or x = (10-2*95^(1/2))/20
x in { (10-2*95^(1/2))/20, (2*95^(1/2)+10)/20}
x in { (10-2*95^(1/2))/20, (2*95^(1/2)+10)/20 }
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