(5x + 7) - (x + 2)
(-x + 12) - (-4x + 2)
(-x + 3) - (4x - 10)
(-7x + 1) - (4x - 5)
(-9x + 1) - (-7x + 8)
(-9x - 12) - (x - 8)
(5x - 1) - (-3x + 7)
(11x + 2) - (-8x - 2)
(x - 2) - (x - 6)
(2x - 6) - (x - 7)
(-5x + 3) - (-7x - 1)
(-3x - 9) - (4x + 8)
(-5x + 4) - (-9x – 2)
(-12x - 6) - (-4x + 3)
(2x + 4) - (5x - 2)
(x - 9) - (2x - 1)