Question 5 Answer & Explanation - SAT Algebra

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algebra

Solve: $10x - 7 = 3x + 21$

2.8

Correct Answer: D

Choice Ahoice D is the correct answer.

Subtract 3x: $7x - 7 = 21$
Add 7: $7x = 28$
Divide by 7: $x = 4$
Verify: $10(4) - 7 = 33$ and $3(4) + 21 = 33$ ✓

Choice Ahoice D is incorrect because calculation error.

Choice Ahoice C is incorrect because calculation error.

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