Join Karin Hutchinson for an indepth discussion in this video Solving a twostep equation, part of Foundations of Algebra: Solving Equations.
 In this next lesson, we're going to continue…looking at TwoStep Equations.…Our next example, we're going to solve for r.…And we have r  3 = 36.…At first glance, you may not think that this is…a twostep equation, because it looks like…we only need to get rid of the three…in order to solve for r.…But let's see what happens.…I know that the three is a constant,…and that's the number that I can get rid of first.…So we're going to start by bringing down…the lefthand side, r  3,…and since I'm subtracting three,…I know that I can add three…in order to get r by itself.…
So I'm going to add 3 to the lefthand side,…and on the righthand side,…I'm also going to add 3…so that I can keep my equation balanced.…Back on the lefthand side,…we have 3 + 3, which is zero,…so I'm left with r = 39.…Now, is r an acceptable way to present your answer?…And that answer is no.…We need to make sure that r is positive,…and that's why this didn't look like…a twostep equation, but it is,…because now we need to make sure…that r is positive.…
Author
Karin HutchinsonReleased
10/19/2015 Isolating variables
 Keeping equations balanced
 Solving addition and subtraction equations
 Solving multiplication and division equations
 Solving equations that involve the distributive property
 Solving twostep and multistep equations
 Solving equations with decimals and fractions
 Solving equations with variables on both sides
 Understanding literal equations
 Solving absolute value equations
Skill Level Appropriate for all
Duration
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Introduction

Welcome1m 4s


1. Introduction to Solving Equations

Keeping equations balanced1m 30s

2. Addition Equations

3. Subtraction Equations

4. Multiplication Equations

5. Division Equations

6. TwoStep Equations

Solving a twostep equation1m 56s

7. Solving Multistep Equations with the Distributive Property

8. Solving Equations with Decimals

9. Solving Equations with Fractions

10. Solving Literal Equations

11. Equations with Variables on Both Sides

12. Solving Multistep Equations

13. Solving Absolute Value Equations

Conclusion

Next steps37s

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Video: Solving a twostep equation