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D( x )
2*x+1 = 0
2*x-1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:-1/2) U (-1/2:1/2) U (1/2:+oo)
9/(2*x+1)-((8*x)/(2*x-1)) = -4 // + 4
9/(2*x+1)-((8*x)/(2*x-1))+4 = 0
9/(2*x+1)-8*x*(2*x-1)^-1+4 = 0
9/(2*x+1)+(-8*x)/(2*x-1)+4 = 0
(9*(2*x-1))/((2*x+1)*(2*x-1))+(-8*x*(2*x+1))/((2*x+1)*(2*x-1))+(4*(2*x+1)*(2*x-1))/((2*x+1)*(2*x-1)) = 0
9*(2*x-1)-8*x*(2*x+1)+4*(2*x+1)*(2*x-1) = 0
16*x^2-16*x^2+10*x-9-4 = 0
10*x-13 = 0
(10*x-13)/((2*x+1)*(2*x-1)) = 0
(10*x-13)/((2*x+1)*(2*x-1)) = 0 // * (2*x+1)*(2*x-1)
10*x-13 = 0
10*x-13 = 0 // + 13
10*x = 13 // : 10
x = 13/10
x = 13/10
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