Question 1206481
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It appears we start with the multiples of 2
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ...
and then we alternate between positive and negative
-2, 4, -6, 8, -10, 12, <font color=red>-14, 16</font>, -18, 20, ...


If that assumption is correct, then the next two values would be <font color=red>-14 and 16</font> in that order.


Keep in mind that sequence problems like this are fundamentally flawed. 
Why is that? 
Check out my previous response on <a href = "https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1195799.html">this page</a> for more information.
The summary of what I mention is that the sequence 1,2,4 could have infinitely many possible numbers as the fourth term; questions that ask about the next term are often too vague to answer. Further context is needed.
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