tolong bantu dikumpulin sekarang

12x=(360°-(108° × 2)):2
12x=(360°-216°):2
12x=144°:2
12x=72°
x=6

4z=180°-58°-72°
4z=50
z=12,5

5x+2y=180°-58°
30+2y=122°
2y=122°-30°
2y=92°
y=46

x°+y°+z°
=6+46+12,5
=64,5°