Possible?

Number Theory Level 1

1  □  12  □  13  □  14  □  15  □  16  □  17  □  18  □  19  □  110  □  111  □  112=0\large 1 \; \square \; \dfrac{1}{2} \; \square \; \dfrac{1}{3}\; \square \; \dfrac{1}{4}\; \square \; \dfrac{1}{5} \; \square \; \dfrac{1}{6} \; \square \; \dfrac{1}{7} \; \square \; \dfrac{1}{8} \; \square \; \dfrac{1}{9} \; \square \; \dfrac{1}{10} \; \square \; \dfrac{1}{11} \; \square \; \dfrac{1}{12}= 0

Can you fill the boxes with + and −+ \text{ and } - to make this equation true?

Áron Bán-Szabó by Áron Bán-Szabó
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