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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 15/18 // - 15/18
20/x-(15/18) = 0
20/x-5/6 = 0
20*x^-1 = 5/6 // : 20
x^-1 = 1/24
-1 < 0
1/(x^1) = 1/24 // * x^1
1 = 1/24*x^1 // : 1/24
24 = x^1
x = 24
x = 24
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