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D( u )
u-((u+1)/2) = 0
u-((u+1)/2) = 0
u-((u+1)/2) = 0
(-1*(u+1))/2+u = 0
(-1*(u+1))/2+(2*u)/2 = 0
2*u-1*(u+1) = 0
u-1 = 0
(u-1)/2 = 0
(u-1)/2 = 0 // * 2
u-1 = 0
u-1 = 0 // + 1
u = 1
u in (-oo:1) U (1:+oo)
(4*u)/(u-((u+1)/2)) = 9 // - 9
(4*u)/(u-((u+1)/2))-9 = 0
(4*u)/((-1*(u+1))/2+u)-9 = 0
(-1*(u+1))/2+u = 0
(-1*(u+1))/2+u = 0
(-1*(u+1))/2+(2*u)/2 = 0
2*u-1*(u+1) = 0
u-1 = 0
(u-1)/2 = 0
(u-1)/2 = 0 // * 2
u-1 = 0
(4*u)/(u-1)-9 = 0
(4*u)/(u-1)+(-9*(u-1))/(u-1) = 0
4*u-9*(u-1) = 0
9-5*u = 0
(9-5*u)/(u-1) = 0
(9-5*u)/(u-1) = 0 // * u-1
9-5*u = 0
9-5*u = 0 // - 9
-5*u = -9 // : -5
u = -9/(-5)
u = 9/5
u = 9/5
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