Tolong dijawabyaaaaaaaaaaaaaa no.20

(3x-15) + (2x+5) = 90
3x+2x-15+5 =90
5x-10 =90
5x =90+10
5x=100
x= 100/5
x=20

BOC= 2x+5
=( 2 × 20) + 5
=40+5
=45°

semoga membantu.