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1/2 - 3/4 = El mcm de 2 y 4 es 4
(1 * 2)/(2 * 2) - 3/4 =
2/4 - 3/4 =
(2 - 3)/4 =
- 1/4
3/2 - 1/7 =
(3 * 7)/(2 * 7) - (1 * 2)/(2 * 7) =
21/14 - 2/14 =
(21 - 2)/14 =
19/14