I believe it's 7x over 6.
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18/21 x 15 is 12 6/7
2/5 x 1/3 x 9/14 = 18/210 = 3/35
gcf(18, 21, 42) = 3. 18 = 2 x 3^2 21 = 3 x 7 24 = 2^3 x 3 hcf = 3
18 over 21 in lowest terms is 6/7
6 x 3 = 18 7 x 3 = 21 therefore 6 to 7 = 18 to 21