Solve 2x +9 = 31.

Answer and explanation

Correct answer: A. 11

  1. Step 1: Move the constant: 2x = 31 - 9 = 22.
  2. Step 2: Divide by 2: x = 11.
Answer
11.
Why not the others: 20: the sign of the constant was not reversed when moving it. 22: the equation was not divided by the coefficient of x. 42: the constant was added to the wrong side.

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