Algebra Practice Test 2026 – The Complete Guide to Mastering Your Exam Success!

Question: 1 / 400

If 3x = 21, what is the value of x?

3

7

To solve the equation 3x = 21, you need to isolate x. This can be achieved by dividing both sides of the equation by 3.

So, doing the math step-by-step:

1. Start with the equation: 3x = 21.

2. To isolate x, divide both sides of the equation by 3:

\( x = \frac{21}{3} \).

3. Now, perform the division:

\( x = 7 \).

This shows that the value of x is 7, confirming that the correct answer is indeed the one that represents this value. The other choices do not satisfy the equation, as substituting them back into the original equation would not hold true. Thus, understanding this mathematical operation makes it clear why the chosen answer is correct.

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21

9

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