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The equation x + 6 = 11 can be solved by

  1. Subtraction

  2. Division

  3. Multiplication

  4. Addition

The correct answer is: Subtraction

To solve for x in the equation x + 6 = 11, one needs to isolate the x variable on one side of the equation. In this case, 6 is added to x, so to undo this operation, we need to subtract 6 from both sides. This will leave us with just x on the left side and 5 on the right side, giving us the correct answer of x = 5. None of the other options - division, multiplication, or addition - would be effective in isolating and solving for x in this equation.