# Question: 20 what are the 4 things you can do to...

###### Question details

20. What are the 4 things you can do to an equation without changing the solutions?

21. Solve the following equation. Your answer should be a fraction. Show your work. 2x − 4 = 9

22. Solve the following equation. Your answer should be a fraction. Show your work. 2x− 7 = 5x

23. Solve the following equation for x. Your answer should be a fraction. Show your work. 2x − 7 = ax

24. Solve the following equation for a. Your answer should be a fraction. Show your work. 2x− 7 = ax

25. Multiply each term of the following equation by 15. Simplify each multiplication but do no further simplification. Your answer should have 4 terms in it. x − 2/3 = 3/5 x − 2

26. Multiply each term of the following equation by 4. Simplify each multiplication but do no further simplification. Your answer should have 3 terms in it. 2x − 3/4 = x/2

27. Multiply each term of the following equation by x 2 .
Simplify each multiplication but do no further simplification. Your
answer should have 3 terms in it. x/ a + 2/ a^{2} = a

28. Give an example of an equation with no solution.

29. Simplify by combining like terms. Do not use a decimal approximation for π. πx − x