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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
1/u-8 = 5 // - 5
1/u-8-5 = 0
1*u^-1 = 13 // : 1
u^-1 = 13
-1 < 0
1/(u^1) = 13 // * u^1
1 = 13*u^1 // : 13
1/13 = u^1
u = 1/13
u = 1/13
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