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13x - 7(13)y = 94(13)
13x - 91y = 1222
ahora sumamos:
-13x + 11y = -163
13x - 91y = 1222
------------------------
2y = 1059
y = 1059/2
sustituimos en ecuacióon original
-x + 7y = 94
-x + 7(1059/2) = 94
-x = 94 - 7(1059/2)
x = -94 + 7(1059/2)
x = 3612.5