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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3-4/u = 2-((7/4)*u)-12 // - 2-((7/4)*u)-12
(7/4)*u-4/u-2+3+12 = 0
7/4*u^1-4*u^-1+13*u^0 = 0
(7/4*u^2+13*u^1-4*u^0)/(u^1) = 0 // * u^2
u^1*(7/4*u^2+13*u^1-4*u^0) = 0
u^1
(7/4)*u^2+13*u-4 = 0
(7/4)*u^2+13*u-4 = 0
DELTA = 13^2-(-4*4*(7/4))
DELTA = 197
DELTA > 0
u = (197^(1/2)-13)/(2*(7/4)) or u = (-197^(1/2)-13)/(2*(7/4))
u = 2/7*(197^(1/2)-13) or u = -2/7*(197^(1/2)+13)
u in { -2/7*(197^(1/2)+13), 2/7*(197^(1/2)-13)}
u in { -2/7*(197^(1/2)+13), 2/7*(197^(1/2)-13) }
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