(х+450)-3540=50
х+450=50+3540
х+450=3590
х=3590-450
х=3140
1234+n=50601
n=50601-1234
n=49367
(x+450)-3540=4000÷80
(x+450)-3540=50
x+450=3540+50
x+450=3590
x=3590-450
x=3140
(х+450)-3540=50
х+450=50+3540
х+450=3590
х=3590-450
х=3140
1234+n=50601
n=50601-1234
n=49367
(x+450)-3540=4000÷80
(x+450)-3540=50
x+450=3540+50
x+450=3590
x=3590-450
x=3140