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Tenemos :
a + a/2 = 56
Resolvemos :
(2a + a)/2 = 56
2a + a = 56 (2)
3a = 112
a = 112/3
Solución :
a = 112/3
a + a/2 = 56
2a/2 + a/2 = 56
(2a + a)/2 = 56
3a/2 = 56
3a = 56 * 2
3a = 112
a = 112/3
respuesta.
a = 112/3