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1) m - 2n = 4 (3)
2) 2m + 3n = 1 (2)
3m - 6n = 12
4m + 6n = 2
----------------------
7m + 0n = 14
7m = 14
m = 14/7
m = 2
Reemplazo m en 2
2m + 3n = 1
2 (2) + 3n = 1
4 + 3n = 1
3n = 1 - 4
3n = - 3
n = -3/3
n = - 1
Solución :
m = 2
n = - 1