tolong pake cara yaa kk mksii

A)
(9a+12) - (7a+14)
= 9a + 12 - 7a - 14
= 2a - 2

B)
(11x^2 - 17x + 24) - (2x^2 + 15x - 18)
= 11x^2 - 17x + 24 - 2x^2 - 15x + 18
= 9x^2 - 32x + 42

C)
(15p + 18q - 17) - (12p - 7q + 6)
= 15p + 18q - 17- 12p + 7q - 6
= 3p + 25q + 23

D)
(4p - 11q - 9r) - (-8p + 10q - 9r)
= 4p - 11q - 9r + 8p - 10q + 9r
= 12p - 21q

E)
4(7y^2 + 6y - 5) - (-5(4y^2 - 2y + 8)
= 28y^2 + 24y - 20 - (-20y^2 +10y - 40)
= 28y^2 + 24y - 20 + 20y^2 - 10y + 40
=48y^2 + 14y + 20