pakai cara ya kak!!!

x + 15 + 3x + 10 + 35= 180 derajat
= 4x + 60 derajat= 180 derajat
= 4x = 180-60
= 4x = 120
x = 120/4
x = 30

x+15+3x+10+35=180
4x+60=180
4x=180-60
4x=120
x=30