Răspuns:
(x+1)|9
x=9-1
x=8
Verificare: (8+1)|9=9|9
(x-2)|15
x=15+2
x=17
Verificare: (17-2)|15=15|15
(2x-3)|21
2x=21+3
2x=24
x=24:2
x=12
Verificare: (2•12-3)|21=21|21
(2x+1)|25
2x=25-1
2x=24
x=24:2
x=12
Verificare:(2•12+1)|25=25|25
(2x-1)|15
2x=15+1
2x=16
x=16:2
x=8
Verificare:(2•8-1)|15=15|15
(2x+1)|35
2x=35-1
2x=34
x=34:2
x=17
Verificare:(2•17+1)|35=35|35