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3x-(x + 1) =3x-x-1=2x-1
(2x + 1) + (a + 5) = 2x+1 +a+5=2x+a+6
(5x + 5) - (x - 1) =5x + 5 -x+1=4x+6
b) 3x-(x + 1) = 3x - x - 1 = 2x - 1
c) (2x + 1) + (a + 5) = 2x + 1 + a + 5 = a + 2x + 6
d) (5x + 5) - (x - 1) = 5x + 5 - x + 1 = 4x + 6