80°+4x°=180°
4x°=100°
x=25°
130°+3y+5°=180°
3y+135°=180°
3y=45°
y=15°
x+y
=25°+15°
=40°
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80°+4x°=180°
4x°=100°
x=25°
130°+3y+5°=180°
3y+135°=180°
3y=45°
y=15°
x+y
=25°+15°
=40°