7/8x = 21
7 = 21*8x
168x = 7
x = 7/168 = 1/24
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7x/8 = 21 so 7x = 21*8 x = 12*8/7 = 3*8 = 24
Some equivalent fractions of 7/8 are: 7/8 = 14/16 = 21/24 = 28/32
5/12 / 7/8 = 5/12 * 8/7 = 40/84 = 20/42 = 10/21
7 over 8
How about: 3 times -7 = -21