Ответ:

х-17/3=35/6÷7/9=35/6×9/7=5/2×3/1

х-17/3=15/2=7 1/2

х=15/2+17/3=45/6+34/6

х=79/6=13 1/6

35/6÷(79/6-17/3)=7/9

7/9=7/9