Set 15: Linear Equations (Advanced)

Explanation

Answer: B

Solve: $5x + 2x + 4 = 25$

✓ Correct

Detailed Explanation

Choice B is correct. Choice A is the correct answer. 1. Combine: $7x + 4 = 25$ 2. Subtract 4: $7x = 21$ 3. Divide by 7: $x = 3$ 4. Verify: $15+ 6 + 4 = 25$ ✓ Choice D is incorrect because it results from an error in the solution process. Choice B is incorrect because it results from an error in the solution process. Choice C is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 3

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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