Helen wrote and solved the equation. x minus 17 = 56. X minus 17 + 17 = 56 minus 17. X = 39. What was Helen's error? Helen only needed to add 17 to the left side of the equation. Helen should have added 17 to both sides of the equation. Helen's work is correct. Helen made a subtraction error when subtracting 17 from 56.
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