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b) (30 - 7 + 4 ) + (8 - 12)=(23+4)+(-4)=27-4=23
c) ( 20 - 5 + 10) + ( 8 - 12)=(15+10)+(-4)=25-4=21
d) (10 - 15 + 5 ) + (9 - 5 )=(-5+5)+(4)=0+4=4
e) (-30 - 4 ) + (-6 + 9)=(-34)+(3)=-34+3=-31