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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)
(x+1)/(2*x-1) = (4*x-3)/(2*x+1) // - (4*x-3)/(2*x+1)
(x+1)/(2*x-1)-((4*x-3)/(2*x+1)) = 0
(x+1)/(2*x-1)+(-1*(4*x-3))/(2*x+1) = 0
((x+1)*(2*x+1))/((2*x-1)*(2*x+1))+(-1*(4*x-3)*(2*x-1))/((2*x-1)*(2*x+1)) = 0
(x+1)*(2*x+1)-1*(4*x-3)*(2*x-1) = 0
13*x-6*x^2-2 = 0
13*x-6*x^2-2 = 0
13*x-6*x^2-2 = 0
DELTA = 13^2-(-6*(-2)*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)-13)/(-6*2) or x = (-121^(1/2)-13)/(-6*2)
x = 1/6 or x = 2
(x-1/6)*(x-2) = 0
((x-1/6)*(x-2))/((2*x-1)*(2*x+1)) = 0
((x-1/6)*(x-2))/((2*x-1)*(2*x+1)) = 0 // * (2*x-1)*(2*x+1)
(x-1/6)*(x-2) = 0
( x-1/6 )
x-1/6 = 0 // + 1/6
x = 1/6
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 1/6, 2 }
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