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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
5/4 = 10/u-5 // - 10/u-5
5/4-(10/u)+5 = 0
5/4-10*u^-1+5 = 0
-10*u^-1 = -25/4 // : -10
u^-1 = 5/8
-1 < 0
1/(u^1) = 5/8 // * u^1
1 = 5/8*u^1 // : 5/8
8/5 = u^1
u = 8/5
u = 8/5
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