add the following
(-3)+(-3)=
(+4)+(-8)=
(-8)+(+12)=
(-11)+(+11)=
0+(-9)
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add the following
(-3)+(-3)=
(+4)+(-8)=
(-8)+(+12)=
(-11)+(+11)=
0+(-9)
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Answer:
(-3)+(-3)= -6
(+4)+(-8)= -4
(-8)+(+12)= 4
(-11)+(+11)= 0
0+(-9)= -9