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= -4-7+6+8
= -11+14
= 3
2. 7+9+6+(-3)+(-4)
=7+9+6-3-4
=22-7
= 14
3. (-11)+(-7)+(-8)+(-3)
= -11-7-8-3
=-29
4. (-9)+(-3)+(-8)+3
=-9-3-8+3
=-20+3
= -17
5. (-3)+3+(-7)+7
= -3+3-7+7
= 0
6. (-4)+(-3)+9+(-3)
= -4-3+9-3
=-10+9
= -1