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4*(-4)-13*(-2)-15:5=-16+26-3=7
[(4-7)*(-3)-20]*(-2)=[(-3)*(-3)-20]*(-2)=[9-20]*(-2)=-11*(-2)=22
-2*(-7)+44:(-11)-78:(-39)=14+(-4)+2=12
6-[7*(-2)-(2-5)]=6-[-14-(-3)]=6-[-11]=17
-40:[-4*(-3)-5*(7-3)]=-40:[(12)-5*(4)=-40:[12-20]=-40:(-8)=5
-12-[3-2*(-14+50]=-12-[3+18]=-12-21=-33
[-24:(-9)+2*(-11)]*(-2)=[-2 2/3+(-22)]*(-2)=[-24 2/3]*[-2]=-74/3*(-2/1)=148/3=49 1/3