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x= minuendo
x/5 = sustraendo
(x-x/5) = diferencia
planteamos la ecuación
x+( x/5) +(x-x/5) = 780
2x = 780
x = 390 // minuendo
sustraendo = x/5 = 390/5 =78
diferencia = x-x/5 = 390-78 = 312
prueba la suma de los tres términos es 780
390+78+312 =780
780= 780