Solving Exercise 3 on pages 131-132 in Math 4 textbook

Guide to solving Exercise 3 on pages 131-132 in Math 4 textbook

Solution Method:
- For parts a) and b): To find the unknown term (denoted as x), subtract the known term from the total
- For part c): To find the subtracted term (denoted as x), subtract the subtraction from the difference. 

Here is the guide to solving Exercise 3 on page 131 of Math 4 textbook, part of the concentrated exercise. Additionally, this section includes four more exercises: Solving Exercise 1 on pages 131-132 Math 4, Solving Exercise 2 on pages 131-132 Math 4, Solving Exercise 4 on pages 131-132 Math 4, and Solving Exercise 5 on pages 131-132 Math 4. Let's also explore the guide to solving Math 4 page 131, 132 concentrated exercises for a better understanding of the subject!