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Paginas leidas = 15
Paginas no leidas = 3x/4
x = 3x/4 + 15
x - 3x/4 = 15
4x/4 - 3x/4 = 15
(4x - 3x)/4 = 15
x/4 = 15
x = 15 *4
x = 60
Total de paginas = 60
Faltan por leer = 60 - 15 = 45
La paginas que faltan por leer son 45