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b) 2 * (-4) + 7 - 12 * (-2) =[-8]+7-[-24]=(-1)-[-24]=23
c) 24 - 4 * (-1) + 6 - 2 - (-20)=24-[-4]+6-2=28+6-2=36
d) 32 : (-8) + 11 - 9 : 3 + 20=[-4]+11-3+20=24
e) - 6 : (-2) : (-1) - (-8) : 2=[-3]-[-4]=1
f) 90 : (-15) + (-7) - (-4) =[-6]-7+4=-13+4=-9
b)-8+7+24=-8+31=23
c)24+4+6-2+20=54-2=52
d)-4+11-3+20=-7+31=24
e)3:(-1)-(-4)=-3+4=1
f)-6-7+4=-13+4=-9