Tolong jawab yak, pakai cara kecuali no 21

maaf kalo salah.
kalo bisa jadikan jawaban terbaik yah lgi butuh

19). 5a + 4 +7a + 8 = 180
5a + 7a = 180 - 4 - 8
12a =  168
a = 14
<CBD = 7a + 8
= 7(14) + 8
= B. 106°

20). 3x + 2x+ 5 + 25 = 180
3x + 2x = 180 - 5 - 25
5x = 150
x = 30
<A = 2x + 5
=2(30) + 5
= C. 65°