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n+36=4n
36=4n-n
3n=36
n=36/3
n=12
El número que buscas es = s
El cuádruple del número es = 4s
Resolvemos:
s + 36 = 4s
s - 4s = - 36
- 3s = - 36
s = - 36/-3
s = 12
Respuesta
El número es 12