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=-3+{[-8+5]+12}+6
=-3+{-3+12}+6
=-3+9+6
=6+6= 12
b: -(-12)-{-[(-4)*6]+(-3)(-9)}+4
=+12-{-[-24]+ 27}+4
=12-{-[3}+4
=12+3+4=19
c: (-5)(-4)-{20-(-6+4)^2+[81/(-9)]}
=+20-{20-(-2)^2+[-9]}
=20-20-(4)-9
=-4-9=-13
d:-50+{[(-10+3)(-4)+(-72)/9]}^2-(8*5)
=-50+{[(-7)(-4)+(-8)]}^2-(40)
=-50+{[28-8]}^2-40
=-50+{20}^2-40
=-50+40-40=-50