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Twice the sum of a number and 9 is equal to three times the difference of the number and 2.
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47: 4 aisha changed 1.45 + 2.38 to 1.5 + 2.4 in order to estimate the sum. what estimation method did she use?
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Twice the sum of a number and 9 is equal to three times the difference of the number and 2....
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