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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 54 // - 54
y/x-54 = 0
x^-1*y = 54 // : y
x^-1 = 54/y
-1 < 0
1/(x^1) = 54/y // * x^1
1 = x^1*(54/y) // : 54/y
1/(54/y) = x^1
x = 1/(54/y)
x = 1/(54/y)
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