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D( x )
3*x-4 = 0
6*x-7 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
6*x-7 = 0
6*x-7 = 0
6*x-7 = 0 // + 7
6*x = 7 // : 6
x = 7/6
x in (-oo:7/6) U (7/6:4/3) U (4/3:+oo)
2/(6*x-7)-(5/(3*x-4)) = 0
2/(6*x-7)-5*(3*x-4)^-1 = 0
2/(6*x-7)-5/(3*x-4) = 0
(2*(3*x-4))/((6*x-7)*(3*x-4))+(-5*(6*x-7))/((6*x-7)*(3*x-4)) = 0
2*(3*x-4)-5*(6*x-7) = 0
27-24*x = 0
(27-24*x)/((6*x-7)*(3*x-4)) = 0
(27-24*x)/((6*x-7)*(3*x-4)) = 0 // * (6*x-7)*(3*x-4)
27-24*x = 0
27-24*x = 0 // - 27
-24*x = -27 // : -24
x = -27/(-24)
x = 9/8
x = 9/8
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