40 + x = 7k
----------- ----
30 + x = 6k
240k + 6xk = 210k + 7xk
30k = xk
30 = x
Rpta: dentro de 30 años.
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40 + x = 7k
----------- ----
30 + x = 6k
240k + 6xk = 210k + 7xk
30k = xk
30 = x
Rpta: dentro de 30 años.