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12* (12+x) * (12+2x) = 2688
(144 + 12x) *(12+2x) =2688
24x² + 432 x - 960 = 0
x² + 18x - 40 = 0
(x+20) (x-2) = 0
x= -20 y 2
Numeros: 12, 14 y 16.