8 Operations

Logic Level 1

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

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?

2 3 4 5 6 7 8 9