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D( u )
u-2 = 0
u+2 = 0
u-2 = 0
u-2 = 0
u-2 = 0 // + 2
u = 2
u+2 = 0
u+2 = 0
u+2 = 0 // - 2
u = -2
u in (-oo:-2) U (-2:2) U (2:+oo)
6-(5/(u+2)) = -6/(u-2) // + -6/(u-2)
6-(5/(u+2))-(-6/(u-2)) = 0
6*(u-2)^-1-5*(u+2)^-1+6 = 0
6/(u-2)-5/(u+2)+6 = 0
(-5*(u-2))/((u+2)*(u-2))+(6*(u+2))/((u+2)*(u-2))+(6*(u+2)*(u-2))/((u+2)*(u-2)) = 0
6*(u+2)-5*(u-2)+6*(u+2)*(u-2) = 0
6*u^2+u-24+22 = 0
6*u^2+u-2 = 0
6*u^2+u-2 = 0
6*u^2+u-2 = 0
DELTA = 1^2-(-2*4*6)
DELTA = 49
DELTA > 0
u = (49^(1/2)-1)/(2*6) or u = (-49^(1/2)-1)/(2*6)
u = 1/2 or u = -2/3
(u+2/3)*(u-1/2) = 0
((u+2/3)*(u-1/2))/((u+2)*(u-2)) = 0
((u+2/3)*(u-1/2))/((u+2)*(u-2)) = 0 // * (u+2)*(u-2)
(u+2/3)*(u-1/2) = 0
( u+2/3 )
u+2/3 = 0 // - 2/3
u = -2/3
( u-1/2 )
u-1/2 = 0 // + 1/2
u = 1/2
u in { -2/3, 1/2 }
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