Main content

### Course: Algebra (all content) > Unit 2

Lesson 2: Why we do the same thing to both sides of an equation# One-step equations intuition

In this math lesson, we learn how to solve a balance scale problem with unknown mass. We represent the problem using an algebraic equation, 3x = 9, where x is the unknown mass. By dividing both sides by 3, we find that x = 3, meaning each object has a mass of 3 kilograms. Created by Sal Khan.

## Want to join the conversation?

No posts yet.