Question

(Х+450)-3540=4000:80

Answer 1

(x + 450) - 3540 = 400 / 8 или же  50
x + 450 = 3540 + 50
x = 3590 - 450 = 3140
Ответ: 3140

Answer 2

(x+450)-3540=50
x+450=50+3540;
x+450=3590
x=3590-450;
x=3140;
Ответ:3140.