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8x+y=21.
(-1) 3x+y=11 quedaria -3x-y= -11
Se eliminan las "y":
8x=21
-3x= -11
5x = 10
x=2
Reemplazando:
8(2)+y=21
16+y=21
y=21-16
y=5
x=2 y=5