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El numero = x
3/7 de x = 18
3/7 * x = 18
3x/7 = 18
3x = 18 * 7
x = (18 * 7)/3 Simplificas el 3
x = 6 * 7
x = 42
El numero es el 42
4/9 de x = 20
4/9 * x = 20
4x/9 = 20
4x = 20 * 9
x = (20 * 9)/4 Simplificas el 4
x = 5 * 9
x = 45
El numero es el 45