If 3 + x = 10, what is x?

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Prepare for the MTTC Lower Elementary PK–3 Mathematics 119 Exam with engaging flashcards and multiple-choice questions. Each question comes with hints and explanations to help you succeed in your exam!

Multiple Choice

If 3 + x = 10, what is x?

Explanation:
To find the value of x in the equation 3 + x = 10, we start by isolating x. This can be done by subtracting 3 from both sides of the equation. When we execute this step, our equation becomes: x = 10 - 3. Now we perform the subtraction on the right side: x = 7. Thus, the correct answer is that x equals 7. This solution illustrates the fundamental concept of balancing equations—what you do to one side must also be done to the other. This is a key principle in solving for unknowns in algebra, which is foundational for mathematical understanding in early education.

To find the value of x in the equation 3 + x = 10, we start by isolating x. This can be done by subtracting 3 from both sides of the equation.

When we execute this step, our equation becomes:

x = 10 - 3.

Now we perform the subtraction on the right side:

x = 7.

Thus, the correct answer is that x equals 7. This solution illustrates the fundamental concept of balancing equations—what you do to one side must also be done to the other. This is a key principle in solving for unknowns in algebra, which is foundational for mathematical understanding in early education.

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