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De los datos:
edad actual de Neo = x
edad de Neo dentro de 20 años = x + 20
x + x + 20 = 4x - 12
2x + 20 = 4x - 12
20 + 12 = 4x - 2x
32 = 2x
32 / 2 = x
16 = x
x = 16 años