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3x+2x-x=80
4x=80
x=80/4
x=20
el número ea el 20
llamaremos al numero x:
2x seria el doble y 3x seria el triple y aumentar un numero es simplemente sumar, por ende:
2x + 3x = x + 80
5x = x + 80
5x - x = 80
4x = 80
x = 80/4
x = 20