594:(8x-55)=18

8х-55=594:18

8х-55=33

8х=33+55

8х=88

х=88:8

х=11

735:(6х+17)=21

6х +17 = 735 :21

6х +17 = 35

6х = 35-17

6х = 18

х = 18 :6

х= 3