Iva got the correct answer and Lorraine's answer was incorrect. Lorraine did everything correct except 1 common mistake at the end. At the end of the problem, you have the equation 2x = 20. Instead of dividing by 2, it's possible that Lorraine mixed up the steps and divided by 10 on both sides to get x = 2. You're supposed to divide 2x by 2 and 20 by 2 to get a quotient of 10.
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