Sederhanakan bentuk aljabar berikut (1)5a+7b-2a+b (2)12a+9-4(2a-3) (3)4p(3p+2a-7)-3p(5p-4a+2)

(1)5a-2a+7b+b=0
3a+8b=0
(2)12a+9-8a+12
4a+21

1) 5a-2a+7b+b = 3a+8b
2) 12a+9-8a+12 = 12a -8a+9+12= 4a+21
3) 12p^2 +8pa-28p -15p^2 +12pa-6p =
12p^2 - 15p^2 +8pa+12pa-28p-6p =
-3p^2+20pa-34p

*maaf klo salah*