Tolong jwb no 4 guys

Nilai x
180 = 40 + 7x
180-40 = 7x
140 = 7x
20 = x

Nilai y
180 = 80 + 2y + 80
180 = 160 + 2y
180-160 = 2y
20 = 2y
10 = y

Nilai Z
4z = 40
z = 40/4
z = 10

<BCG = 80

maaf klk salh