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La mitad = a/2
Resolvemos :
a/2 - 1 = 213/3
a/2 - 1 = 71
a/2 = 71 + 1
a/2 = 72--el 2 está dividiendo pasa multiplicar
a = 72 * 2
a = 144
Solución : El número es = 144
Espero te ayude!