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gasto total= 15300
total de artículos: lapices+borradores= 15
total de lápices = x
precio de cada lapiz = 1200
total de borradores = 15 - x
precio de cada borrador = 750
1200(x) + 750(15-x) = 15300
al resolver: x=9
lápices= x = 9
borradores= 15-x = 15-9 = 6
Espero haberte ayudado.
: )