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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120 = 18/x // - 18/x
120-(18/x) = 0
120-18*x^-1 = 0
-18*x^-1 = -120 // : -18
x^-1 = 20/3
-1 < 0
1/(x^1) = 20/3 // * x^1
1 = 20/3*x^1 // : 20/3
3/20 = x^1
x = 3/20
x = 3/20
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