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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(30/1)/x = -31 // + 31
(30/1)/x+31 = 0
30/x+31 = 0
30*x^-1 = -31 // : 30
x^-1 = -31/30
-1 < 0
1/(x^1) = -31/30 // * x^1
1 = -31/30*x^1 // : -31/30
-30/31 = x^1
x = -30/31
x = -30/31
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