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D( x )
2*x-1 = 0
x+1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:1/2) U (1/2:+oo)
2/(2*x-1) = 3/(x+1) // - 3/(x+1)
2/(2*x-1)-(3/(x+1)) = 0
2/(2*x-1)-3*(x+1)^-1 = 0
2/(2*x-1)-3/(x+1) = 0
(2*(x+1))/((2*x-1)*(x+1))+(-3*(2*x-1))/((2*x-1)*(x+1)) = 0
2*(x+1)-3*(2*x-1) = 0
5-4*x = 0
(5-4*x)/((2*x-1)*(x+1)) = 0
(5-4*x)/((2*x-1)*(x+1)) = 0 // * (2*x-1)*(x+1)
5-4*x = 0
5-4*x = 0 // - 5
-4*x = -5 // : -4
x = -5/(-4)
x = 5/4
x = 5/4
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