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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
10/u = 3/8 // - 3/8
10/u-(3/8) = 0
10/u-3/8 = 0
10*u^-1 = 3/8 // : 10
u^-1 = 3/80
-1 < 0
1/(u^1) = 3/80 // * u^1
1 = 3/80*u^1 // : 3/80
80/3 = u^1
u = 80/3
u = 80/3
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