a)=-4+2x(1-5)=-4+2x(-4)=-4+-8=-12
b)=20-5x(2-6)+3x(-7)=20-5x(-4)+3x(-7)=20-20+-21=-21
c)=10-3x(-1-4)=10-3x(-5)=10-+15=-5
d)=16:(-2)+10:(-5)-(-12):(-3)=16:8:-17:-3=2:-17:-3=2:-17:-3:1=2:-51
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a)=-4+2x(1-5)=-4+2x(-4)=-4+-8=-12
b)=20-5x(2-6)+3x(-7)=20-5x(-4)+3x(-7)=20-20+-21=-21
c)=10-3x(-1-4)=10-3x(-5)=10-+15=-5
d)=16:(-2)+10:(-5)-(-12):(-3)=16:8:-17:-3=2:-17:-3=2:-17:-3:1=2:-51