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6 - 7 + 8 + 4 - 2
6+8+4 -7-2
18 - 9
9
46 - [38 - (-2)] + [-9 + (42 - 18 + -15) - (-7)]
46 - [38 +2] + [ -9 + (24-15) +7]
46 - [40] + [ -9 + (9) +7]
46 - 40 + [ -9 + 9 +7]
6 - [ +7]
6-7
-1