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402+[1002:3-(100+a)×2]:14=408

Răspuns :

402+[334-(100+a)x2]:14=408
[334-(100+a)x2]:14=408-402=6
334-(100+a)x2=6x14=84
(100+a)x2=334-84=250
100+a=250:2=125
a=125-100
a=25