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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
26/u = 65/10 // - 65/10
26/u-(65/10) = 0
26/u-13/2 = 0
26*u^-1 = 13/2 // : 26
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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