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Lo que tiene Juan = x
Lo que tiene carlos = 28 - x
Si Juan gasta 4 le quedan = x - 4
x - 4 = 2(28 - x)
x - 4 = 56 - 2x
x + 2x = 56 + 4
3x = 60
x = 60/3
x = 20
Juan tiene x = 20
Carlos tiene = 28 - x = 28 - 20 = 8
Respuesta.
Carlos tiene 8 y Juan 20