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-12-7 = -19+9 =
-10
2. 2-(-3)+4 =
2+3+4 =
5+4 = 9
- (12+7) + 9
- 19 + 9
9 - 19
- 10
2 - (-3) + 4 =
2 (+) 3 + 4
2 + 3 + 4
5 + 4
9