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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-x+1-3x-y = -x-2y+1
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