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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
68/59 = 20/x // - 20/x
68/59-(20/x) = 0
68/59-20*x^-1 = 0
-20*x^-1 = -68/59 // : -20
x^-1 = 17/295
-1 < 0
1/(x^1) = 17/295 // * x^1
1 = 17/295*x^1 // : 17/295
295/17 = x^1
x = 295/17
x = 295/17
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