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1. 65/12+ 12/7. 65/12 - 12/7
= 455/84 + 144/84. = 455/84 - 144/84
= 599/84. = 344/84
division- 599/84 ÷ 344/84
= 599/344
2. 2/7 × 3/8
= 3/28
3/28 - x = -3/7
the number that should be subtracted= 12/28
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