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D( x )
4*x-13 = 0
6*x-2 = 0
4*x-13 = 0
4*x-13 = 0
4*x-13 = 0 // + 13
4*x = 13 // : 4
x = 13/4
6*x-2 = 0
6*x-2 = 0
6*x-2 = 0 // + 2
6*x = 2 // : 6
x = 2/6
x = 1/3
x in (-oo:1/3) U (1/3:13/4) U (13/4:+oo)
(3*x+1)/(6*x-2) = (2*x+5)/(4*x-13) // - (2*x+5)/(4*x-13)
(3*x+1)/(6*x-2)-((2*x+5)/(4*x-13)) = 0
(3*x+1)/(6*x-2)+(-1*(2*x+5))/(4*x-13) = 0
((3*x+1)*(4*x-13))/((6*x-2)*(4*x-13))+(-1*(2*x+5)*(6*x-2))/((6*x-2)*(4*x-13)) = 0
(3*x+1)*(4*x-13)-1*(2*x+5)*(6*x-2) = 0
-61*x-3 = 0
(-61*x-3)/((6*x-2)*(4*x-13)) = 0
(-61*x-3)/((6*x-2)*(4*x-13)) = 0 // * (6*x-2)*(4*x-13)
-61*x-3 = 0
-61*x-3 = 0 // + 3
-61*x = 3 // : -61
x = 3/(-61)
x = -3/61
x = -3/61
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