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(-12)+(-18)=-30
-8-(-(-2))=-8-2=-10
(-4)-(-4)=-4+4=0
-(-7)-(-7)=7+7=14
4-(-5)+(-8)=4+5-8=1
-4+(-3)=-7
(31)-(-9)=31+9=40
5+(-4)+(-1)=5+(-5)=0
-12+10=-2
14+(-64)= -50
21+(-4)=17