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

Lesson 3: One-step addition & subtraction equations# One-step addition & subtraction equations

In this lesson, we learn how to solve simple equations with one unknown variable. To find the unknown, we remove extra numbers by doing the opposite operation on both sides of the equation. This keeps the equation balanced and helps us find the value of the unknown variable. Created by Sal Khan.

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