Answer: Colin's reasoning makes sense. If Marge subtracted 20 from both sides of an equation, the equation she was solving could have been 6 + t = 20. On the left side of the equation, 6 + t would be simplified to t. On the right side of the equation, 20 would be subtracted from 20, resulting in a value of 0. So, the equation t = 0 would be the result of Marge's actions.
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