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Tenemos.
El número = x
Antecesor del número = x - 1
x/2 < x - 1
x/2 - x < - 1
x/2 - 2x/2 < - 1
(x - 2x)/2 < - 1
- x/2 < - 1
- x < - 2
x > 2
x∈(2 , inf)
Solución.
x∈(2 , inf)