5x/6*(2/3)=1/6. 10x=3. x=3/10. 11/15-3x/5=4/15. 11-3*3x=4. 9x=7. x=7/9. 2x/3+1/2=7/8. 2x/3=7/8-1/2. 2x=21/8-3/2. x=21/16-3/4. =(21-12)/4. =9/4. x/5/(4/15)=2.x/5=2*(4/15). x=8/3..