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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12 = 89/x // - 89/x
12-(89/x) = 0
12-89*x^-1 = 0
-89*x^-1 = -12 // : -89
x^-1 = 12/89
-1 < 0
1/(x^1) = 12/89 // * x^1
1 = 12/89*x^1 // : 12/89
89/12 = x^1
x = 89/12
x = 89/12
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