263: Make Equal with Parentheses

Insert parentheses into each of the following expressions so that each will have the same value.

4 + 3 * 7 - 4

2 * 3 + 3 * 5

2 * 5 - ½ * 10 * 9

3² ÷ ⅓ + 3 * 6

Algebra Problems, Dale Seymour.