7. The answer is 7 (seven).
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subract mean to take a away an amount and then you have small amount left over.
The pattern shown is add one, subract two, subract two, then add four.
-1
XXXI = 31
negative 7 because, you subract them and keep the highest sign. Or you can do it this way --------- these are 9 negatives ++ those are 2 positives if you cross them out from top to bottom, you get 7 negatives left over therefore -7.