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Tomas = m
m + 7 + m = 31
m + m + 7 = 31
2m + 7 = 31
2m = 31 - 7
2m =24
m = 24/2
m = 12
m + 7 = 12 + 7 = 19
Solución :
Alejandra tiene = 19 discos
Tomas tiene = 12 discos