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6k + 21 = 3

6k + 21 - 21 = 3 - 21

6k = -18

6k/6 = -18/6

k = -3

A check to make sure this is right:

6(-3) + 21 = 3

-18 + 21 = 3

3 = 3

Yes, this is correct.

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14y ago

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