-a²bc/2-abc/3+a²bc/2+abc/6-a²b=-abc/6-a²b=-(-4)(-2)(-3)/6-(-4)²(-2)=4+32=362m-{n+[4n-3(m+2n)+6m]-5n}=2m-{n+[4n-3m-6n+6m]-5n}=2m-{n-2n+3m-5n}=2m+6n-3m=6n-m=6(-4)-2/3=-24-2/3=-74/3