Respuesta :

20x-100=180
x=14
12(14)-60
108
180-108
z=72

Answer:

x=14 z=72

Step-by-step explanation:

(8x-40)+(12x-60)=180

20x-100=180

20x=280

x=14

(12x-60)+z=180

(168-60)+z=180

108+z=180

z=72