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2/3 de = 1680
2/3 de x = 1680
x * 2/3 = 1680
2x/3 = 1680
2x = 1680 * 3
2x = 5040
x = 5040/2
x = 2520
Solución : 2/3 de 2520 es = 1680
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El número = x
4/9 de x = 1800
x * 4/9 = 1800
4x/9 = 1800
4x = 1800 * 9
4x = 16200
x = 16200/4
x = 4050
Solución : 4/9 de 4050 es = 1800