SOLUTION: _,3,17 what's the first number of the sequence?

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Question 969238: _,3,17 what's the first number of the sequence?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
From the second to third, you add 14.
So from the first to second, you add 14.
X%2B14=3
X=3-14
X=-11
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-11,3,17