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b)x- (2x-3) = x - 2x + 3 = -x +3
c)3x - (y - 2x) = 3x - y + 2x= 5x - y
d) -(3a + 6) - 4= -3a -6 - 4 = -3a -10
e) -(2x - 1)-(3x+1) = -2x + 1 -3x -1 = -5x
f) (4a - 7b) - (2a + 3b) = 4a - 7b - 2a - 3b = 2a - 10b
g) (2p - r) + (2r - p) = 2p - r + 2r - p = p + r
h) (x + y) + (x-z) +(z-y) = x + y + x - z + z - y = 2x