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15+15*[88-3*(42-225:15+a)-36:6]:5=18

Răspuns :

15+15*[88-3*(42-15+a)-6]:5=18
15+15*[88-3*(27+a)-6]=90
15*[88-3*(27+@)-6]=105
88-3*(27+@)-6=1575
88-3*(27+@)=1581
3*(27+@)=1493
27+@=4479
@=4479-27
@=4452