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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12 = 83/x // - 83/x
12-(83/x) = 0
12-83*x^-1 = 0
-83*x^-1 = -12 // : -83
x^-1 = 12/83
-1 < 0
1/(x^1) = 12/83 // * x^1
1 = 12/83*x^1 // : 12/83
83/12 = x^1
x = 83/12
x = 83/12
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