1.  

(20x + 7) - (20x + 8)

2.  

(18x² + 6x + 4) - (10x² + 19x + 18)

3.  

(-14x² + 16x + 14) - (-17x² - 5x - 8)

4.  

(20x⁵ + 8x⁴ + 8x³) - (4x⁶ + 20x³ + 11)

5.  

How much greater is -4x² + 13x - 13 than 8x² - 5x - 6?

6.  

(11x² + 13x + 9) - (-6x² + 11x + 7)

7.  

(-17x² + 13x - 4) - (20x² + 8x + 12)

8.  

From 8x² - 15x - 9 subtract -17x² - 12x - 7

9.  

From -19x² + 4x + 17 subtract 18x² + 9x + 17

10.  

Subtract 17x² - 5x⁵ + 7x⁴  from -11x⁵ - 7x² - 8x