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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
5/13 = 6/u // - 6/u
5/13-(6/u) = 0
5/13-6*u^-1 = 0
-6*u^-1 = -5/13 // : -6
u^-1 = 5/78
-1 < 0
1/(u^1) = 5/78 // * u^1
1 = 5/78*u^1 // : 5/78
78/5 = u^1
u = 78/5
u = 78/5
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