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y: multiplicador
(x-2)(y-4) = xy - 198
xy - 4x - 2y + 8 = xy - 198
-4x - 2y + 8 = -198
se sabe que : 8 = x-y
Entonces
-4x - 2y + (x-y) = -198
-3x - 3y = -198
-3(x+y) = -198
x+y = 66
La suma de los factores es 66