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a)(3x-y)+(x-1)=3x-y+x-1=-1+4x-y
b)(3x-y)+(x-1)-(-3x-y)=3x-y+x-1+3x+y=7x-1
c)(3x-y)-(x-1)-(-3x-y)=3x-y-x+1+3x+y=5x+1
d)(3x-y)-[(x-1)-(-3x-y)]=(3x-y)-[x-1+3x+y]=3x-y-[4x+y-1]=3x-y-4x-y+1=-1x-2y+1