College Math Placement Practice Test 2026 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

If 5 + 3x = 20, what is the value of x?

x = 3

x = 4

x = 5

To solve the equation $5 + 3x = 20$, we begin by isolating the term that contains $x$.

First, subtract 5 from both sides of the equation to eliminate the constant on the left side:

5 + 3x - 5 = 20 - 5

This simplifies to:

3x = 15

Next, to solve for $x$, divide both sides by 3:

x = \frac{15}{3}

Calculating the right side gives us:

x = 5

This value of $x$ satisfies the original equation, confirming that it is correct. To verify, substitute back into the original equation:

5 + 3(5) = 5 + 15 = 20

Since both sides of the equation equal 20, the solution $x = 5$ is validated, making it the correct answer.

x = 6

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