Set 1: Linear Equations (Intermediate)

**Choice D is the best answer.** Solve step by step: x = 10

Explanation

Answer: D

PROBLEM

Solve for x: 2x + 1 = 21

✓ Correct

Detailed Explanation

Choice D is the best answer. Solve step by step: x = 10

Why others are wrong:

A: 8 is incorrect because it does not satisfy the equation.

B: 20 is incorrect because it does not satisfy the equation.

C: 11 is incorrect because it does not satisfy the equation.