Answer
{3}
Work Step by Step
5x+3 = 18
Step 1: Subtract 3 from both the sides
5x+3 - 3 = 18 -3
Step 2: Simplify
5x = 15
Step 3: Divide both the sides by 5
$\frac{5x}{5}$ = $\frac{15}{5}$
Step 4: Simplify
x = 3
Now we check the proposed solution, 3, by replacing x with 3 in the original equation.
Step 1: the original equation 5x+3 = 18
Step2: Substitute 3 for x
5.3 + 3 = 18
Step 3: Multiply 5.3 = 15
15 + 3 = 18
Step 4: Add 15+3 = 18
18 = 18
Since the check results in true statement, we conclude that the solution set of the given equation is {3}