-8/7a
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15/14 x 2/3 = 30/42 or 5/7
It is: 7 times 7 equals 49
5 = 1 x 5, 21 = 3 x 7 3 x 5 = 15, 1 x 7 = 7, 15 - 7 = 8 so: (5x + 7)(x - 3)
3 x 1/2 = 3/2 or 6/4. If you're adding 7/4 and 3/4 to that, the answer is 16/4, which equals 4.
6/7 - 2/7 = 4/7