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El doble del número = 2x
La mitad = x/2
Resolvemos :
2x + x/2 = 100
2 (2x) + x
------------- = 100
2
4x + x
-------- = 100
2
4x + x = 200
5x = 200
x = 200/5
x = 40
Solución : El número es = 40