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Libro= x+20
x+x+20=38
2x+20=38
2x=38-20
2x=18
x=18/2
x= 9
Remplazamos en "x"
Bolígrafo: 9
Libro: 9+20= 29
9+29=38
38=38
Libro: $29
Bolígrafo:$ 9