## Thinking Mathematically (6th Edition)

6x =18 Step 1: Divide both the sides by 6 $\frac{6x}{6}$ = $\frac{18}{6}$ Step 2: Simplify x= 3 Now we check the proposed solution, 3, by replacing x with 3 in the original equation. Step 1: the original equation 6x=18 Step2: Substitute 3 for x 6.3 = 18 Step 3: Solve 6.3=18 18 = 18 Since the check results in true statement, we conclude that the solution set of the given equation is {3}.