5/6=2x/3. 4/9=8x/45. 5x/12=2/3. 6/7=10x/21. 8/9=4x/27. 27/5x=9/16.

5/6=2х/3 ; х=5/6*3/2; х=5/4=1 1/44/9=8х/45; х=4/9*45/8; х=5/2 = 2 1/25х/12=2/3; х=2/3*12/5; х=8/5 = 1 3/56/7=10х/21; х=6/7*21/10; х=9/5 = 1 4/58/9=4х/27; х=8/9*27/4; х=3*2=627/5х=9/16; х=27/5*16/9; х=3/5*16 = 48/5 = 9 3/5