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El numero que no conoces lo llamas x
2/3 de x = 1680
2/3 * x = 1680
2x/3 = 1680
2x = 1680 * 3
x = (1680 * 3)/2 Simplificas el 2
x = 840 * 3
x = 2520
Respuesta.
x = 2520