1)x-(x-(2x-3))=x-x-2x+3=-2x+3.
2)5m-((n-m)+3n)=5m-n+m+3n=6m+2n
3)4p-(3p-(2p-(p+1)))=4p-3p-2p-p-1=-2p-1
4)5x-(2x-((y-x)-2y))=5x-2x-y+x-2y=4x-3y
5)2/3(6a-3/8b)-2/11(4 1/8a-33b)=
=4a-1/4b-3/4a+6b=13/4a+23/4b
6)-2/9(2,7m-1,5n)+5/6(2n-0,48m)=-3/5m+1/3n+5/3n-2/5m=-1m+2n