That's the same as 45/7 times 7/4 = 45/4 or 11 and 1/4
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2/5 plus 1/15 equals 6/15+1/15 equals 7/15.
u = 7
5 x 7 and 6 x 7
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