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La mitad = m/2
Resolvemos :
m + m/2 = 39
(2m + m)/2 = 39
(3m)/2 = 39
3m = 39 * 2
3m = 78
m = 78/3
m = 26
Solución : El número es = 26
la mitad del numero es:x/2
planteamos la ecuacion.
x+x/2=39
2x+x/2=39
3x=78
x=26