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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18 = y/x // - y/x
18-(y/x) = 0
x^-1*(-y) = -18 // : -y
x^-1 = 18/y
-1 < 0
1/(x^1) = 18/y // * x^1
1 = x^1*(18/y) // : 18/y
1/(18/y) = x^1
x = 1/(18/y)
x = 1/(18/y)
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