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D( u )
2*u = 0
2*u = 0
2*u = 0
2*u = 0 // : 2
u = 0
u in (-oo:0) U (0:+oo)
11/(2*u) = 13/6 // - 13/6
11/(2*u)-(13/6) = 0
11/(2*u)-13/6 = 0
11/2*u^-1 = 13/6 // : 11/2
u^-1 = 13/33
-1 < 0
1/(u^1) = 13/33 // * u^1
1 = 13/33*u^1 // : 13/33
33/13 = u^1
u = 33/13
u = 33/13
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