3,-6,12,4,20,? I am having issues figuring this out

I am stumpted on number sequences...question is 3,-6,12,4,20, ?
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3-1*9=-6+2*9=12-1*8=4+2*8=20-1*7=13+2*7=27-1*6=21+2*6=33...

Best I can offer really. Not enough of the series to check it out.

by Top Rated User (1.2m points)

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