Calcule:
(+5)+(-8)=
(-2)-(-3)=
(-3)-(-9)=
(-7)-(-8)=
(-8)+(-6)-(-7)=
(-4)+(-6)+(-3)=
15-(-3)-(-1)=
32-(+1)-(-5)=
-(10+1)-(-3)+5-2=
-(10+1)-(-3)+5-2=

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