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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u = 10/45 // - 10/45
4/u-(10/45) = 0
4/u-2/9 = 0
4*u^-1 = 2/9 // : 4
u^-1 = 1/18
-1 < 0
1/(u^1) = 1/18 // * u^1
1 = 1/18*u^1 // : 1/18
18 = u^1
u = 18
u = 18
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