Yes, 1*21 and 3*7 equal 21, and 1*34 and 2*17 equal 34.
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21/34. 21 and 34 have no common factors (21=3x7, 34=2x17) so it's impossible to reduce it any further.
34 times with a remainder of 13
21 and 13.. 21-13=8 21+13=34 34/2 = 17,+4 = 21... 34-21 = 13
21