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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 12/38 // - 12/38
18/x-(12/38) = 0
18/x-6/19 = 0
18*x^-1 = 6/19 // : 18
x^-1 = 1/57
-1 < 0
1/(x^1) = 1/57 // * x^1
1 = 1/57*x^1 // : 1/57
57 = x^1
x = 57
x = 57
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