a)
(-12)+(-8)-(7)-(-9)= -12-8-7+9= -18
8-(-9)+(-11)-(5)= 8+9-11-5= 1
(-21)+(-7)-(15)-(-32)= -21-7-15+32= -11
-(-13)+(-2)-(16)+(-5)= 13-2-16-5= -10
b)
[(-16)-(-4)]-(-8+6)= [-16+4]+8-6= -12+8-6= -10
[-(11)-(-6)]+(-5+8)= [-11+6]-5+8= 5-5+8= 8
(-19)-[-(-18)-(7)]+(-34)= -19-[18-7]-34= -19-11-34= -64
-(27)-(-26-17)+(14)= -27+26+17+14= 30
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a)
(-12)+(-8)-(7)-(-9)= -12-8-7+9= -18
8-(-9)+(-11)-(5)= 8+9-11-5= 1
(-21)+(-7)-(15)-(-32)= -21-7-15+32= -11
-(-13)+(-2)-(16)+(-5)= 13-2-16-5= -10
b)
[(-16)-(-4)]-(-8+6)= [-16+4]+8-6= -12+8-6= -10
[-(11)-(-6)]+(-5+8)= [-11+6]-5+8= 5-5+8= 8
(-19)-[-(-18)-(7)]+(-34)= -19-[18-7]-34= -19-11-34= -64
-(27)-(-26-17)+(14)= -27+26+17+14= 30