Find the value of the variables.

1. ${\displaystyle \!3x+\!3=\!21}$
2. ${\displaystyle \!6-\!5x=\!-4}$
3. ${\displaystyle \!3y+\!5=\!8+\!2y}$
4. ${\displaystyle \!6x-\!5=\!31}$
5. ${\displaystyle \!31x+\!5=\!36}$
6. ${\displaystyle \!5x-\!2=4{\tfrac {1}{2}}x}$
7. ${\displaystyle \!10x+\!5=\!10{\tfrac {1}{2}}x}$
8. ${\displaystyle \!5x-\!3=\!4x+\!2}$
9. ${\displaystyle \!6x-\!4=\!7x-\!17}$
10. ${\displaystyle \!10x+\!2=\!20x-\!28}$
11. ${\displaystyle \!36x+\!11=\!11x+\!1136}$
12. ${\displaystyle \!15x=\!5+\!25}$
13. ${\displaystyle \!5x+\!6=3x+\!10}$
14. ${\displaystyle \!8y-\!1=\!36-\!5}$
15. ${\displaystyle \!4x+\!6=\!24}$
16. ${\displaystyle \!5y-\!4=\!6y-\!14}$
17. ${\displaystyle \!6+\!3x=\!5x}$
18. ${\displaystyle \!10y+\!5=\!20}$
19. ${\displaystyle \!2x+\!3=\!3x-\!7}$
20. ${\displaystyle \!4y+\!6=\!-16}$
21. ${\displaystyle \!5x=\!4x+\!10}$
22. ${\displaystyle \!4y+\!3=\!-8}$
23. ${\displaystyle \!x-\!5=\!9}$
24. ${\displaystyle {\frac {2}{3}}+\!x={\frac {5}{6}}}$
25. ${\displaystyle \!x-5{\tfrac {2}{5}}=13{\tfrac {3}{10}}}$
26. ${\displaystyle \!63x+\!2126=\!53426}$
27. ${\displaystyle \!86+\!5y=\!101}$
28. ${\displaystyle \!15y-\!5=13{\tfrac {1}{3}}y}$
29. ${\displaystyle \!2(\!5y+\!3)=\!26}$
30. ${\displaystyle \!5x-\!20=\!100}$
31. ${\displaystyle \!64+\!x-(\!66-\!5)=\!140}$