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230-{4ori[2+5ORI(98-5orib)-137]}=10 e urgent!!!

Răspuns :

{4ori[2+5ori(98-5orib)-137]}=220
2+5ori(98-5orib)-137=220/4=55
5ori(98-5orib)=55+135=190
98-5orib=190/5=38
5orib=60=>b=12