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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-(7*I) = 18/x // - 18/x
4-(7*I)-(18/x) = 0
4-7*I-18*x^-1 = 0
-18*x^-1 = -(4-7*I) // : -18
x^-1 = (4-7*I)/18
-1 < 0
1/(x^1) = (4-7*I)/18 // * x^1
1 = x^1*((4-7*I)/18) // : (4-7*I)/18
18*(4-7*I)^-1 = x^1
x = 18*(4-7*I)^-1
x = 18*(4-7*I)^-1
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