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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x+10 = x // - x
11/x-x+10 = 0
11*x^-1-1*x^1+10*x^0 = 0
(10*x^1-1*x^2+11*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^1-1*x^2+11*x^0) = 0
x^1
10*x-x^2+11 = 0
10*x-x^2+11 = 0
DELTA = 10^2-(-1*4*11)
DELTA = 144
DELTA > 0
x = (144^(1/2)-10)/(-1*2) or x = (-144^(1/2)-10)/(-1*2)
x = -1 or x = 11
x in { -1, 11}
x in { -1, 11 }
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