# Chapter 2 Linear Equations and Functions - 2.4 Write Equations of Lines - 2.4 Exercises - Mixed Review - Page 104: 61

-7

#### Work Step by Step

In order to solve the equation, we must first get the terms with variables all on one side of the equation and the constant numbers on the other side of the equation. Then, we must isolate the variable. Note, to check the solution, we could plug the found value back into the equation and check that both sides of the equation get the same value. Doing this, we obtain: $$-3x=21\\x=-7$$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.