8 Operations

Logic Level 1

1    2    3    4    5    6    7    8    9=33\large 1 \; \square \; 2 \; \square \; 3\; \square \; 4\; \square \; 5 \; \square \; 6 \; \square \; 7 \; \square \; 8 \; \square \; 9 = 33

Seven of the eight "\square"s above are filled with "++", and the other one with "-".

Before which integer should the "-" sign be placed to make the equation true?

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