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402 + [ 1 002 : 3 - ( 100 + a ) x 2] : 14 = 408

Răspuns :

402+[1002:3-(100+a)X2]:14=408
[334-(100+a)X2]:14=408-402
[334-(100+a)X2]:14=6
[334-(100+a)X2]=6x14
334-(100+a)X2=84
(100+a)X2=334-84
(100+a)X2=250
100+a=250:2
100+a=125
a=125-100
a=25