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