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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
-69*x-23 = 0
(-69*x-23)/((6*x+2)*(4*x-13)) = 0
(-69*x-23)/((6*x+2)*(4*x-13)) = 0 // * (6*x+2)*(4*x-13)
-69*x-23 = 0
-69*x-23 = 0 // + 23
-69*x = 23 // : -69
x = 23/(-69)
x = -1/3
x in { -1/3}
x belongs to the empty set
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