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El número que no conoces lo llamas x
x ÷ - 4/7 = 5/3
x * - 7/4 = 5/3
- 7x/4 = 5/3
- 7x = 5 * 4/3
- 7x = 20/3
x = 20/(3 * - 7)
x = 20/- 21
x = - 20/21
Respuesta.
- 20/21 ÷ - 4/7 = 5/3