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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/(3*x-4) = 5/(6*x-7) // - 5/(6*x-7)
2/(3*x-4)-(5/(6*x-7)) = 0
2/(3*x-4)-5*(6*x-7)^-1 = 0
2/(3*x-4)-5/(6*x-7) = 0
(2*(6*x-7))/((3*x-4)*(6*x-7))+(-5*(3*x-4))/((3*x-4)*(6*x-7)) = 0
2*(6*x-7)-5*(3*x-4) = 0
6-3*x = 0
(6-3*x)/((3*x-4)*(6*x-7)) = 0
(6-3*x)/((3*x-4)*(6*x-7)) = 0 // * (3*x-4)*(6*x-7)
6-3*x = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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