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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*y = 18/x // - 18/x
3*y-(18/x) = 0
3*y-18*x^-1 = 0
-18*x^-1 = -(3*y) // : -18
x^-1 = y/6
-1 < 0
1/(x^1) = y/6 // * x^1
1 = x^1*(y/6) // : y/6
6*y^-1 = x^1
x = 6*y^-1
x = 6*y^-1
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