Solve 2x + 7 = 19. What is x?

Solve 2x + 7 = 19. What is x?

• A. x = 5
• B. x = 7
• C. x = 6
• D. x = 8

Answer: (C)

When solving a basic linear equation, you isolate the variable by undoing operations step by step. Subtract 7 from both sides to remove the constant term: 2x = 12. Then divide both sides by 2 to isolate x: x = 6. To confirm, substitute back: 2(6) + 7 = 12 + 7 = 19, which matches the right side. The other values would not satisfy the equation (for example, 5 gives 17, 7 gives 21, 8 gives 23), so the correct solution is x equals 6.

When solving a basic linear equation, you isolate the variable by undoing operations step by step. Subtract 7 from both sides to remove the constant term: 2x = 12. Then divide both sides by 2 to isolate x: x = 6. To confirm, substitute back: 2(6) + 7 = 12 + 7 = 19, which matches the right side. The other values would not satisfy the equation (for example, 5 gives 17, 7 gives 21, 8 gives 23), so the correct solution is x equals 6.