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Chicas = m
Resolvemos :
m + 7 + m = 21
m + m + 7 = 21
2m + 7 = 21
2m = 21 - 7
2m = 14
m = 14/2
m = 7
m + 7 = 7 + 7 = 14
Solución :
Hay 14 chicos y 7 chicas