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The solution (not sum) to the equation 21 = 3c + 6 is as follows:

21 = 3c + 6

21 - 6 = 3c + 6 - 6

15 = 3c

3c = 15

3c/3 = 21/3

c = 7

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13y ago
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Q: What is the sum of 21 equals 3c plus 6?
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