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Varones x mujeres x + 1
Cantidad de hermanos del hermano x - 1
Cantidad de hermanas del hermano 2(x - 1)
x + 1 = 2(x - 1)
x + 1 = 2x - 2
1 + 2 = 2x - x
3 = x
R/ Son 3 varones y 4 mujeres.