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D( x )
x-2 = 0
x+1 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:2) U (2:+oo)
(4*x)/(x+1) = (4*x-3)/(x-2) // - (4*x-3)/(x-2)
(4*x)/(x+1)-((4*x-3)/(x-2)) = 0
(4*x)/(x+1)+(-1*(4*x-3))/(x-2) = 0
(4*x*(x-2))/((x+1)*(x-2))+(-1*(4*x-3)*(x+1))/((x+1)*(x-2)) = 0
4*x*(x-2)-1*(4*x-3)*(x+1) = 0
3-9*x = 0
(3-9*x)/((x+1)*(x-2)) = 0
(3-9*x)/((x+1)*(x-2)) = 0 // * (x+1)*(x-2)
3-9*x = 0
3-9*x = 0 // - 3
-9*x = -3 // : -9
x = -3/(-9)
x = 1/3
x = 1/3
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