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b) -(3-a) = -3 + a
c) -(-4a-2b) = 4a + 2b
d) -(-2x+3y) = 2x - 3y
e) -(-3x+2y-4z) = 3x - 2y + 4z
f) -(2x-3y+4z-5) = -2x + 3y - 4z + 5
B) -3+a
c)4a+2b
d) 2x-3y
E) 3x-2y+4z
f) -2x+3y-4z+5