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b) 3x-y+x-1-(-3x)-y = 7x-2y-1
c) 3x-y-x-1-(-3x)-y = 3x-y-x-1+3x-y = 5x-2y-1
d) 3x-y-(x-1-3x-y) = 3x-y-2x-1-y = x-2y-1