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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6-1/u = (6/5)*u+1+30 // - (6/5)*u+1+30
6-((6/5)*u)-1/u-30-1 = 0
(-6/5)*u-1/u-30-1+6 = 0
-6/5*u^1-1*u^-1-25*u^0 = 0
(-6/5*u^2-25*u^1-1*u^0)/(u^1) = 0 // * u^2
u^1*(-6/5*u^2-25*u^1-1*u^0) = 0
u^1
(-6/5)*u^2-25*u-1 = 0
(-6/5)*u^2-25*u-1 = 0
DELTA = (-25)^2-(-1*4*(-6/5))
DELTA = 3101/5
DELTA > 0
u = ((3101/5)^(1/2)+25)/(2*(-6/5)) or u = (25-(3101/5)^(1/2))/(2*(-6/5))
u = -5/12*((3101/5)^(1/2)+25) or u = -5/12*(25-(3101/5)^(1/2))
u in { -5/12*((3101/5)^(1/2)+25), -5/12*(25-(3101/5)^(1/2))}
u in { -5/12*((3101/5)^(1/2)+25), -5/12*(25-(3101/5)^(1/2)) }
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