8+(-15)=
-7
9-(-5)=
14
(12)(11)=
132
250/-50=
-5
-9+21=
12
-7-4=
-11
(8)(-4)=
-32
(-56)/(-8)=
14+(-9)+(-20)=
-15
-7-10
-17
(-15)(-4)=
60
-120/40
-3
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