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Si al total de celulares le llamamos x
x-x/4 = 270
4·x-4(x/4) = 4·270
4x-x = 1.080
3x = 1.080
x = 1.080÷3
x = 360.
Respuesta: el comerciante tenía en total 360 celulares.
Comprobamos:
360-360÷4 = 360-90 = 270