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x.y = 74495
(x + 23).y = 74495 + 5405; quitamos paréntesis:
x.y + 23.y = 74495 + 5405; luego 74495 + 23.y = 74495 + 5405;
Luego y = 5405 / 23 = 235
En consecuencia x = 74495 / 235 = 317
Si x es el multiplicador la suma de sus cifras es 11