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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
16/7 = 14.4/u // - 14.4/u
16/7-(14.4/u) = 0
16/7-14.4*u^-1 = 0
-14.4*u^-1 = -16/7 // : -14.4
u^-1 = 0.15873016
-1 < 0
1/(u^1) = 0.15873016 // * u^1
1 = 0.15873016*u^1 // : 0.15873016
6.29999995 = u^1
u = 6.29999995
u = 6.29999995
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