A link I posted from Wednesday or Tuesday's blog for reviewing Algebraic equations:
Please fill in this form afterward to demonstrate what you learned from viewing this site:
1. Change the order of the equation to have the variable on the left side of the equal sign.
x-13 = 21
2. Understand the question: A number subtract 13 equals 21.
3. Use the "balance" method to solve the question:
x-13+13 = 21+13
x = 34
4. I suggest checking the answer by "plugging" in the correct answer to the original question:
 - 13 = 21
21=21: IT BALANCES AND IS CORRECT!!