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(3 /5 * 1/7) - 1/2 =
(3 * 1) /(5 * 7) - 1/2 =
3/35 - 1/2
(3 * 2)/70 - (35 * 1)/70 =
6/70 - 35/70 =
-29/70
Respuesta.
- 29/70