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576-[943-(216+x)=280
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Răspuns :

576 - [ 943 - ( 216 + x ) = 280
943 - ( 216 + x ) = 576 - 280
943 - ( 216 + x ) = 296
216 + x = 943 - 296
216 + x = 647
x = 647 - 216
x = 431.
-[943-(216+x)]=280-576
-[943-(216+x)]=-296(-1)
-(216+x)=296-943
-(216+x)=-647(-1)
x=647-216
x=431