Question

(x-450)-3540=4000:80

Answer 1

(х-450)-3540=50
х-450=50+3540
х-450=3590
х=3590+450
х=4040
проверка
(4040-450)-3540=4000:80
3590-3540=50
50=50

Answer 2

cпс помогла

Answer 3

x-450=4000:80
х-450=50
x-450=3540+50
x=3590+450
x=4040
Ответ:4040