nilai x + y -z=.......tolong dikasih caranya ya

cari nilai masing- masing ;

x :
2x + 40° = 130°
2x = 130° - 40°
2x = 90°
x = 45°


y :
y + 10° = 40°
y = 40° - 10°
y = 30°


z:
3z + 20° = 80°
3z = 80° - 20°
3z = 60°
z = 20°

jadi nilai x + y - z :
= 45° + 30° - 20°
= 55°(C)