Calculadora ---> 7x
Libro -----> x
Portafolio -----> 7x-50
7x+x+7x-50=310
15x=360
x=24
Calculadora=7x=7×24=168
Libro=x=24
Portafolio=7x-50=7×24-50=118
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Calculadora ---> 7x
Libro -----> x
Portafolio -----> 7x-50
7x+x+7x-50=310
15x=360
x=24
Calculadora=7x=7×24=168
Libro=x=24
Portafolio=7x-50=7×24-50=118