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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = x/44 // - x/44
11/x-(x/44) = 0
11*x^-1-1/44*x^1 = 0
(11*x^0-1/44*x^2)/(x^1) = 0 // * x^2
x^1*(11*x^0-1/44*x^2) = 0
x^1
(-1/44)*x^2+11 = 0
(-1/44)*x^2+11 = 0
DELTA = 0^2-(4*11*(-1/44))
DELTA = 1
DELTA > 0
x = (1^(1/2)+0)/(2*(-1/44)) or x = (0-1^(1/2))/(2*(-1/44))
x = -22 or x = 22
x in { -22, 22}
x in { -22, 22 }
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