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D( x )
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
(2*x+1)/(3*x-4)+5/7 = 1 // - 1
(2*x+1)/(3*x-4)+5/7-1 = 0
(7*(2*x+1))/(7*(3*x-4))+(5*(3*x-4))/(7*(3*x-4))+(-1*7*(3*x-4))/(7*(3*x-4)) = 0
7*(2*x+1)+5*(3*x-4)-1*7*(3*x-4) = 0
29*x-21*x-13+28 = 0
8*x+15 = 0
(8*x+15)/(7*(3*x-4)) = 0
(8*x+15)/(7*(3*x-4)) = 0 // * 7*(3*x-4)
8*x+15 = 0
8*x+15 = 0 // - 15
8*x = -15 // : 8
x = -15/8
x = -15/8
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