4(y+y-20)=720
y?~~
4(y+y-20)=720
y+y-20=720?4
y+y-20=180
y+y=1820
2y=200
y=200?2
y=100 =4?10100-20?=4?180=720=?
1
(y+y-20)4?
4(y+y-20)=720
y+y-20=720?4
y+y-20=180
20.
y+y-20=180
y+y=1820 y
y+y=1820
2y=200
1?
y=200?2
y=100
1~~ ~~ p>
y?~~
4(y+y-20)=720
y+y-20=720?4
y+y-20=180
y+y=1820
2y=200
y=200?2
y=100 =4?10100-20?=4?180=720=?
1
(y+y-20)4?
4(y+y-20)=720
y+y-20=720?4
y+y-20=180
20.
y+y-20=180
y+y=1820 y
y+y=1820
2y=200
1?
y=200?2
y=100
1~~ ~~ p>