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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
40/u = 10 // - 10
40/u-10 = 0
40*u^-1 = 10 // : 40
u^-1 = 1/4
-1 < 0
1/(u^1) = 1/4 // * u^1
1 = 1/4*u^1 // : 1/4
4 = u^1
u = 4
u = 4
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