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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.6 = 1-(18/x) // - 1-(18/x)
18/x-1+0.6 = 0
18*x^-1 = 0.4 // : 18
x^-1 = 0.02222222
-1 < 0
1/(x^1) = 0.02222222 // * x^1
1 = 0.02222222*x^1 // : 0.02222222
45.0000045 = x^1
x = 45.0000045
x = 45.0000045
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