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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
7/3 = 52/u // - 52/u
7/3-(52/u) = 0
7/3-52*u^-1 = 0
-52*u^-1 = -7/3 // : -52
u^-1 = 7/156
-1 < 0
1/(u^1) = 7/156 // * u^1
1 = 7/156*u^1 // : 7/156
156/7 = u^1
u = 156/7
u = 156/7
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