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To find out the equation for a sequence, the first thing you note is the difference between the numbers. In this case the difference is:

-8, -8, -8, -8

Thus the formula will be x-8n where x is not yet known.

For linear sequences like the one above, x is the 0th term. In this case it would be the term that would come before 22, or 22+8, or 30.

Thus the equation for the nth term is 30-8n

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