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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6/7.3 = 12/u // - 12/u
6/7.3-(12/u) = 0
6/7.3-12*u^-1 = 0
-12*u^-1 = -0.82191781 // : -12
u^-1 = 0.06849315
-1 < 0
1/(u^1) = 0.06849315 // * u^1
1 = 0.06849315*u^1 // : 0.06849315
14.60000015 = u^1
u = 14.60000015
u = 14.60000015
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