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Carlos = 12 Euros + x
1)Igualamos.
20 -x =12 +x
20-12=2x
8=2x
x=8/2
x=4
2)Comprobamos
20-4=16 Euros
12+4=16 Euros
R// Santiago le debe dar 4 Euros.
Espero que sirva!Saludos!