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2017+[2016:(2015-×)-2013]=2020 Aflati "x" din eglitatea dau coroana la primu care raspunde

Răspuns :

2017+[2016:(2015-×)-2013]=2020
2016:(2015-×)-2013=2020-2017
2016:(2015-×)-2013=3
2016:(2015-×)=2013+3
2016:(2015-×)=2016
2015-×=2016:2016
2015-×=1
×=2015-1 => ×=2014