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2.(-3)+(-4)=(-7)
3.(+5)+(-7)=(-2)
4.(-3)+(+8)=(+5)
5.(+2)+(-3)+(-4)=(-5)
6.(-12)+(-4)+(+8)=(-8)
7.(-21)+(+2)+(+25)+(-2)=(+4)
8.(-10)+(-10)+(+6)+(-11)=(-25)
9.(-22)+(-6)+(+1)+(-1)=(-28)
10.(+25)+(+18)+(-21)+(+17)=(39)