Question

Решите уравнение: (x+x-20)*4+20=580

Answer 1

(х+х-20)×4+20=580
(2х-20)×4+20=580
8х-80+20=580
8х-60=580
8х=640
х=80

Answer 2

(2х-20)*4+20=580
8х-80+20=580
8х=580-20+80
8х=640/8
х=80