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{[(7xa+34):17+18]:5-12}:8=6
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Răspuns :

[(7a+34):17+18]:5-12=48
[(7a+34):17+18]:5=60
(7a+34):17+18=300
(7a+34):17=282
(7a+34)=4794
7a=4760
a=4760:7
a=680