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D( x )
2*x+1 = 0
x-4 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-1/2) U (-1/2:4) U (4:+oo)
(2*x+3)/(x-4)-((2*x-8)/(2*x+1)) = 1 // - 1
(2*x+3)/(x-4)-((2*x-8)/(2*x+1))-1 = 0
(2*x+3)/(x-4)+(-1*(2*x-8))/(2*x+1)-1 = 0
((2*x+3)*(2*x+1))/((x-4)*(2*x+1))+(-1*(2*x-8)*(x-4))/((x-4)*(2*x+1))+(-1*(x-4)*(2*x+1))/((x-4)*(2*x+1)) = 0
(2*x+3)*(2*x+1)-1*(2*x-8)*(x-4)-1*(x-4)*(2*x+1) = 0
2*x^2-2*x^2+24*x+7*x-29+4 = 0
31*x-25 = 0
(31*x-25)/((x-4)*(2*x+1)) = 0
(31*x-25)/((x-4)*(2*x+1)) = 0 // * (x-4)*(2*x+1)
31*x-25 = 0
31*x-25 = 0 // + 25
31*x = 25 // : 31
x = 25/31
x = 25/31
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