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--------------- -
(x-1)(x-3)
x
- ------------------ >0
(x-1)(x-4)
3(x-4)
-------------------- -
(x-1)(x-3)(x-4)
x(x-3)
- ------------------ >0
(x-1)(x-4)(x-3)
3(x-4)-x(x-3)/(x-1)(x-3)(x-4)>0
3x-12-x²+3x/(x-1)(x-3)(x-4)>0
x²-6x+12/(x-1)(x-3)(x-4)<0