tolong kerjakan soal ini,dg caranya mksh ya

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

4z = 80
z = 20

4(20) + 40 + 2y = 180
120 + 2y = 180
2y = 60
y = 30

maka
nilai x + y+ z
= 20 + 30 + 20
= 70°

jawaban A