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1. Zero
2. Positive
3. Negative
4. Undefined

0 / (4+5)

-12/4 - 5

0 x (6-12)

-12(-3) + 7

5/0+ 0

10(-60) - 18

35/( -7) + 6

-42/(-6) + 5 - 8

-3 + 1 x 3

-13(-2) - 16 - 8

3 + 2(-10)

(18+16)/0

5(-4) - 8

18 - -2 - 20

18/0

12 x 6 / 0