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Anonymous
-7 x -4 - 8 = -20
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8 x 7 + (4/4) = 57
2 8/7 divided by 4/7 is the same as 8/7 times 7/4... The 7s then cancel out and you get 8/4 which is 2
7/8 x 4/5 = 28/40 or 7/10
5/8 x 4/7 is 5/14
7/8 x 5 is 4 3/8