х^2 - 7х + 12 = (x - 4) (x - 3)
-х^2 - х + 20 = -(x - 5) (x + 4)
(х^2-7х+12)/(-х^2-х+20) = (x-4)(x-3)/-(x-5)(x+4)
(х^2-7х+12)/(-х^2-х+20) = -(x-4)(x-3)/(x-5)(x+4)
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х^2 - 7х + 12 = (x - 4) (x - 3)
-х^2 - х + 20 = -(x - 5) (x + 4)
(х^2-7х+12)/(-х^2-х+20) = (x-4)(x-3)/-(x-5)(x+4)
(х^2-7х+12)/(-х^2-х+20) = -(x-4)(x-3)/(x-5)(x+4)