21
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No - neither number is a prime ! 42 divides by 2, 3 & 7 - and 93 divides by 3 !
7 can go into 21 , 3 times
7=dd=3 so 7 goes by 3+d = cC=cost and so it equals 10+1902 =1912
1 3 7 9 21 and 63.
X=6 because 27+3=30 and 30 divides by 5 is 6.