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si x = 0
y = 2*0
y = 0
si x = 1
y = 2*1
y = 2
si x = -1
y = 2 (-1)
y = -2
Si x= 3
y = 2*3
y = 6
si x = -3
y = 2(-3)
y = -6
Tabla.
x 0 1 -1 3 -3
y 0 2 -2 6 - 6