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parte que gasta en llamadas = 3/5 x
Parte que le sobra
x - 3/5 x = (5-3)/5 x = 2/5 x
2/5 x / 2 = 4 (ya que la mitad de lo que sobra es $4)
2/5 x = 2*4
2x = 8*5
x = 40/2
x = 20
Lo que tenía originalmente era $20