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[ -8 + 20] : -4 + (18 : 9)
12 : - 4 + 2
-3 + 2 = - 1
(-35):(-5)-3•(5-7)
7 - 15 + 21 = 13
[(-4):(+2)]-[(+7)-(-2)]
[ - 2] - [ 7 + 2]
[- 2] - [9]
- 2 - 9 = - 11