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Course: Algebra (all content) > Unit 2
Lesson 2: Why we do the same thing to both sides of an equationOne-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.
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