(x + 450) - 3540 = 4000 : 80
(x + 450) - 3540=50
х+450=50+3540
х+450=3590
х=3590-450
х=3140
(3140+ 450) - 3540 = 4000 : 80
50=50
(1 234 + n) + 2 140 = 52 741
1234+n=52741-2140
1234+n=50601
n=50601-1234
n=49367
(1 234 + 49367) + 2 140 = 52 741
(x + 450) - 3540 = 4000 : 80
(x + 450) - 3540=50
х+450=50+3540
х+450=3590
х=3590-450
х=3140
(3140+ 450) - 3540 = 4000 : 80
50=50
(1 234 + n) + 2 140 = 52 741
1234+n=52741-2140
1234+n=50601
n=50601-1234
n=49367
(1 234 + 49367) + 2 140 = 52 741