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A - J = 6194 ec. 2
de la ec. 1:
A+J = 30864
A = 30864-J ec. 3
Sustituyendo el valor de la ec. 3 en la ec. 2
A--J = 6194
(30864-J) - J = 6194
30864-J-J = 6194
30864-2J = 6194
-2J = 6194 - 30864
-2J = -24670
J = -24670/-2
J = 12335
Javier tiene $12335
de la ec. 1:
J+A = 30864
12335+A = 30864
A = 30864-12335
A = 18529
Arturo tiene $18529
Compróbemoslo en la ec. 2:
A-J = 6194
18529- 12335 = 6194
6194 = 6194 bien...
Saludos...