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x=17-y
sustituimos el valor de x en la primera ecuacion:
65 (17-y) + 40y = 855
1105 - 65y + 40y = 855
1105 - 855 = 65y - 40y
250 = 15y
250/15 = y
y = 50/3
resolviendo para x
x = 17 - 50/3 = 1/3