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14 A + 17 N = 134500
14A = 134500 - 17N
A = (134500 - 17N) / 14
A remplazamos en la primera ecuacion
10(134500 - 17N) /14 + 9N = 81500
5(134500 - 17N) / 7 + 9N = 81500
5(134500 - 17N) + 63N = 81500 * 7
672500 - 85N + 63N = 570500
672500 - 570500 = 22N
102000 = 22N
N= 102000/22
N = 4636,36
A = (134500 - 17(4636,36)) /14
A= (134500 - 78818,18) / 14
A= 55681,82/14
A= 3977,27