4/x times 6/21 = 24/21x simplify (divide top and bottom by 3) = 8/7x
8 over 7x
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4/7 * 1/6 = (4*1)/(7*6) = (2*1)/(7*3) = 2/21
Yes, it is. 6/21 =2/7 =4/14
7/24 * 6/21 = 1/12
6 over 4 is the same as 21 over 14 because if you set it up as a proportion and do 6*14 and 21*4 it would equal the same thing (which would be 84)
4 x 6 - 3 = 21