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Applying the rules of BODMAS, 15 - (12/3) = 11
3 - (-12) = 3 + 12 = 15.
3
The difference is 15 minus 12 = 3
(+12)-(+15) = -3
7 - 12 / 3 = 7 - 4 = 3
12
(12-15)/5 = -3/5
2/3 minus 12/15 is -2/15
-12 - 3 = -15
- 3 - 12 = -15