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240:[12+(24:x-12:3)-1]=16

Răspuns :

240:[12+(24:x-12:3)-1]=16
[12+(24:x-4)-1]=240:16 
12+(24:x-4)-1=15 /-12
(24:x-4)-1=3 /+1 
24:x-4=4/+4
24:x=8
x=24:8
x=3