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1) X = Cantidad de soles
2) X mas 8
3) 2(x mas 8) mas 9= 2x mas 16 mas 9= 2x mas 25
3) 2x mas 25 sobre 7= x menos 5
4) x menos 5 pasa a multiplicar con 7
5) quedaria= 7x menos 35= 2x mas 25
5x=60
x= 12
Rpta= 12
Le agregas 8:
x + 8
Lo duplicas
2(x + 8) = 2x + 16
Le sumas 9:
2x + 16 + 9 = 2x + 25
Se divide entre 7:
(2x + 25)/7
Se obtiene 5 unidades menos que la cantidad inicial:
(2x + 25)/7 = x - 5
2x + 25 = 7(x - 5)
2x + 25 = 7x - 35
35 + 25 = 7x - 2x
60 = 5x
60/5 = x
x = 12
La cantidad inicial es s/.12
Saludos!