No. 5/12 doesn't reduce to anything.
42/14 = 3
12 over 77
14
14 over 12 can be simplified down to 7 over 6.
To 9/14
14/27 × 17/12 = 119/162
12/14 as a percent is 100*12/14 = 85.714 %
12 over 14 in its simplest form is 6/7
It reduces to 3/14
It is: 14/12 = 7/6
12/14 = 6/7