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[-28-42] +13
[-70]+13
-70+13
-57
[(-15)-(-6)]-(-23)
[-15+6] +23
-9 +23
14
[(+45)-(-4)]-(+17)
[+45+4]-17
[49]-17
49-17
32
[(+27)-(-18)]-(-72)
[+27+18]+72
45 + 72
147