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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-55/x = 110 // - 110
-55/x-110 = 0
-55*x^-1 = 110 // : -55
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
x = -1/2
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