Respuesta :

Hamilton1757
x = 160

Steps:
x+20=180
Subtract 20 from both sides
x+20-20=180-20
20 is crossed out
180-20 = 160
x = 160

To check plug in 160 for x
160 + 20 = 180
180 = 180

Hope this helps you! (:
-Hamilton1757