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402+{1002:3-(100+a)x2}:14=408

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Răspuns :

402+{1002:3-(100+a)x2}:14=408

{1002:3-(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