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35 = 5+6+9+12+x
35 = 32 +x
35-32 = x
3 = x
el quinto dato es 3
(5+6+9+12+x) / 5 = 7
32/5 + x/5 = 7
x/5 = 7- 32/5
Como 7 = 35/5, entonces:
x/5 = 35/5 - 32/5
eliminando términos comunes:
x = 35-32
x = 3
El quinto dato es 3.
Y lo comprobamos:
5+6+9+12+3 = 35
35/5 = 7 comprobado
Saludos....