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aflati numarul necunoscut: 21:[22-21:(28-21:x)]=1

Răspuns :

21:[22-21:(28-21:x)]=1
22-[21:(28-21:x)]=21:1
22-[21:(28-21:x)]=21
21:(28-21:x)=22-21
21:(28-21:x)=1
28-21:x=21:1
28-21:x=21
21:x=28-21
21:x=7
x=21:7
x=3
21:[22-21:(28-21:x)]=1
22-21:(28-21:x) = 21 : 1
22-21:(28-21:x) = 21
21:(28-21:x) = 22 - 21
21:(28-21:x) = 1 
28-21:x = 21:1
28-21:x = 21
21:x = 28 -21
21:x = 7
x = 21:7
x=3