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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-(8*x)+(6*x)/(x^2)-3+15 = 0
9/x-8*x+(6*x)/(x^2)-3+15 = 0
15*x^-1-8*x^1+12*x^0 = 0
(12*x^1-8*x^2+15*x^0)/(x^1) = 0 // * x^2
x^1*(12*x^1-8*x^2+15*x^0) = 0
x^1
12*x-8*x^2+15 = 0
12*x-8*x^2+15 = 0
DELTA = 12^2-(-8*4*15)
DELTA = 624
DELTA > 0
x = (624^(1/2)-12)/(-8*2) or x = (-624^(1/2)-12)/(-8*2)
x = (4*39^(1/2)-12)/(-16) or x = (-4*39^(1/2)-12)/(-16)
x in { (4*39^(1/2)-12)/(-16), (-4*39^(1/2)-12)/(-16)}
x in { (4*39^(1/2)-12)/(-16), (-4*39^(1/2)-12)/(-16) }
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