jika p=18 dan q=25 tentukan nilai aljabar berikut! 19p-30q+23p+29p-12p-9q beserta caranya

(19x18) - (30x25) + (23x18) + (29x18) - (12x18) - (9x25) = 87

p = 18
q = 25

19p - 30q + 23p + 29p - 12p - 9q
= (19p + 23p + 29p - 12p) + (-30q - 9q)
= 59p + (-39q)
= 59p - 39q
= (59 × 18) - (39 × 25)
= 1062 - 975
= 87