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96- (5*5 + a *6 -40) * 2 = 9*10

Răspuns :

96-(25+a×6-40)×2=90
96-(25+a×6-40)=90:2
96-(25+a×6-40)=45
(25+a×6-40)=96-45
(25+a×6-40)=51
(25+a×6)=51+40
(25+a×6)=91
a×6=91-25
a×6=66
a=66:6
a=11

25+anu te lua am gresit scuze