(x+15)° + (3x+10)° + 35° =180
4x+25° + 35° =180°
4x+60°=180°
4x=120°
x=30°
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(x+15)° + (3x+10)° + 35° =180
4x+25° + 35° =180°
4x+60°=180°
4x=120°
x=30°
nilai x
x +15 +3x+10+35 = 180
4x + 60 = 180
4x = 180-60
4x=120
x= 120/4
x=30