Solve for x: 2x + 9 = 31.
Answer and explanation
Correct answer: C. 11
- Step 1: Subtract 9 from both sides: 2x = 22. Step 2. Divide by 2: x = 11. Answer: 11. Why not the others: 20: That adds 9 instead of subtracting it. 13/2: That divides 31 by 2 first and then subtracts 9. 12: That is one more than the solution.
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