no 19-22+cara.............

[20]
(15x-6) + (8x+4) = 90
23x = 90 + 6 - 4
23x = 92
X = 4

(15x-6) = 15(4) - 6
60 - 6 = c. 54

[21]
(4x+5) + 8x + (5x-12) = 180
17x = 180 - 5 + 12
17x = 187
X = 11
4x + 5 = 11(4) + 5
44 + 5 = b.49

[22]
A.

Semoga membantu ;)

19. 2x+3x=90°
5x=90° x=18
2(18)=36°
3(18) =54°
20. 15x-6+8x+4=90°
23x=90+2
x=92/23 = 4
ABD=15(4)-6
= 54°
21. 4x+5+8x+5x-12=180°
17x-7=180°
17x=180°+7
x=187/17
=11
ABE=44+5=49°
22. A

semoga membantu
maaf kalau salah

yang terbaik yaa