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