tolong dibantu no 6, thx

2x+10+2x-30=180
4x-20=180
4x=200
x=50

3y-5+x+30=180
3y-5+50+30=180
3y+80-5=180
3y+75=180
3y=105
y=35

x-y=50-35=15

semoga bermanfaat
maaf kalau salah