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5n-2z=1
1) -4n+2z=2
2) 5n-2z=1
(sumando) 1) + 2)
n=3
reemplazando en 2)
5(3)-2z=1
15-2z=1
-2z=1-15
-2z=-14
z=7
por lo tanto:
n=3 y z=7