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=> 3 + 4 = 7
2. 3 - (1 - 4)
=> 3 - (-3)
=> 3 + 3 = 6
3. 9 - (3 - 5 + 7 - 6)
=> 9 - (-2 + 1)
=> 9 - (-1)
=> 9 + 1 = 10
2 . 3-(1-4) = 3-(-3)=3+3=6
3 . 9-(3-5+7-6)= 9-(-2+1) = 9-(-1) = 9+1= 10