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Entonces tenemos la ecuacion: X - 2/5X - 1/4X = 28
Factorizamos: (1 - 2/5 - 1/4)X = 28
Entonces: [(20 - 8 - 5)/20]X = 28 ⇒ 7/20X = 28;
Despejando x: X = (28 x 20)/7
Entonces tenemos que: X = 80. El profesor tenia 80 lapiceros.