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x - x/3= 120
3(x - x/3= 120)
3x - x= 360
2x= 360
x= 360/2
x= 180
R. Había 180 cuadernos para la venta.
Comprobación:
x - x/3= 120
180 - 180/3= 120
180 - 60= 120
120= 120