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De los coeficientes de m y n
5 + 7 = 3+y + 4 = x + 11
12 = 7 + y = 11 + x
y = 12 -7 = 5
x = 12 - 11 = 1
Los coeficientes:
2x , -5x/y , 2y
La suma seria
2x + 2y - 5(x/y)
2 (1) + 2 (5) - 5(1/5)
2 + 10 - 1 = 11