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Recap: Tidying First

Part of the Fundamentals section of Coddy's Math journey. Lesson 28 of 64.

Challenge

Solve the equation 4(x - 1) + 2x = 20 for x.

Try it yourself

4(x - 1) + 2x = 20

Solve for x

All lessons in Fundamentals

1What an Equation Is

The Equation Finding the Unknown The Same to Both Sides Solved Means Alone Recap: First Equations

4Two-Step Equations

Two Layers to Undo Subtract, Then Divide Add, Then Divide A Division Inside Negatives in Two Steps Recap: Two-Step Equations

7Fractions in Equations

A Fraction Coefficient Clearing One Denominator Two Denominators A Fraction Around a Sum Cross-Multiplying Recap: Fractions

10From Words to Equations

Phrases into Expressions Sentences into Equations Consecutive Numbers Age and Money A Perimeter Problem Recap: Words

2One-Step Equations

Undoing Addition Undoing Subtraction Undoing Multiplication Undoing Division Inverse Operations Recap: One-Step Equations

5Tidying First

Like Terms Terms and Numbers Mixed The Distributive Property Distributing a Subtraction Tidy, Then SolveRecap: Tidying First

8Decimals and Percent

Decimal Coefficients Two-Step with Decimals Adding a Percent Percent Equations Recap: Decimals

11Formulas

Using a Formula Finding a Missing Value Solving for a Letter Temperature Recap: Formulas

3Negative Numbers

Below Zero A Negative Answer Negative Coefficients The Opposite of x Recap: Negatives

6Variables on Both Sides

x on Both Sides Gathering the x's Numbers and x's Everywhere Parentheses on One Side When x Is Negative Recap: Both Sides

9Special Cases

No Solution Always True Checking a Solution Recap: Special Cases

12Final Challenges

Parentheses on Both Sides Fractions and x's Decimals on Both Sides The Story Problem