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B = x-1
C = -3x - y
a) A + B
3x - y + x-1 =
4x - y - 1
b) A - B - C
3x - y - (x-1) - (-3x - y)
3x - y - x + 1 + 3x + y =
5x +1
c) A - (B - C)
3x - y - (x-1 - (-3x-y)
3x - y - (x - 1 + 3x + y)
3x - y - x +1 - 3x -y
-x - 2y +1