yang no 5 pakai cara.. gk bikin bingung

5.
a.
= 9a + 12 - (7a + 14)
= 9a - 7a + 12 - 14
= 2a - 2

b.
= 11x² - 17x + 24 - (2x² + 15x - 18)
= 11x² - 2x² - 17x - 15x + 24 + 18
= 9x² - 22x + 42

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

d.
= 4p - 11q + 9r - (-8p + 10q - 9r)
= 4p + 8p - 11q - 10q + 9r + 9r
= 12p - 21q + 18r

e.
= 4(7y² + 6y - 5) - [-5(4y² - 2y + 8)]
= 28y² + 24y - 20 - (-20y² + 10y - 40)
= 28y² + 20y² + 24y - 10y -20 + 40
= 48y² + 14y + 20

a.) 
[9a + 12] - [7a + 14] = 2a -2

b.)
[11x² - 17x + 24] - [2x² + 15x - 18] = 9x² - 32x + 42

c.)
[15p + 18q - 17] - [12p - 7q +6] = 3p + 25q - 23

d.)
[4p - 11q - 9r] - [-8p +10q -9r] = 12p - 21q

e.)
[4(7y² + 6y - 5)] - [-5(4y² -2y +8)] =
[28y² + 24y - 20] - [-20y² + 10y - 40] =
48y² + 14y + 20