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ANSWER:

The  number is 18

The general relation is

( 2 x X  ) + 2

(2 X 6 ) + 2 = 14
( 2 x 12 ) + 2 = 26
( 2 x 14 ) + 2 = 30
( 2 x 8 ) + 2 = 18

Is that clear?

Am I correct?

Shall we proceed?

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