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(13 - a) (27 + b) = 13x27 - 51
13(27) + 13b - 27a - ab = 13(27) - 51
13b - 27a - ba = - 51
13b - 27a - ba = 13(3) - 27(3) - 3(3) ---> Comparando a = 3 y b = 3
Entonces Hay que aumentar 3 y disminuir 3