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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-(18/x)-18-18 = 0
x/x-18*x^-1-18-18 = 0
-18*x^-1 = 35 // : -18
x^-1 = -35/18
-1 < 0
1/(x^1) = -35/18 // * x^1
1 = -35/18*x^1 // : -35/18
-18/35 = x^1
x = -18/35
x = -18/35
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