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B.12x(-17)+(-16):(-2)=-204+(-16):(-2)=-220:(-2)=110
C-15:(-3)-7x(-4)=5-7x(-4)=-2x(-4)=2
15+(-30)
15+-30
=15
b:b. 12 x (-7) + (-16) : (-2)
= -84 + 8
= -76