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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/12 = -8/x // + -8/x
5/12-(-8/x) = 0
8*x^-1+5/12 = 0
8*x^-1 = -5/12 // : 8
x^-1 = -5/96
-1 < 0
1/(x^1) = -5/96 // * x^1
1 = -5/96*x^1 // : -5/96
-96/5 = x^1
x = -96/5
x = -96/5
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