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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u = 7/3 // - 7/3
4/u-(7/3) = 0
4/u-7/3 = 0
4*u^-1 = 7/3 // : 4
u^-1 = 7/12
-1 < 0
1/(u^1) = 7/12 // * u^1
1 = 7/12*u^1 // : 7/12
12/7 = u^1
u = 12/7
u = 12/7
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