Răspuns:
96-(5×5+a×6-40)×2=9×10
96-(25+a×6-40)×2=90
(25+a×6-40)×2=96-90
(25+a×6-40)×2=6
(25+a×6-40)=6:2
25+a×6-40=3
25+a×6=3+40
25+a×6=43
a×6=43-25
a×6=18
a=18:6
a=3
96-(8×4+a×3)=6×5+19
96-(32+a×3)=30+19
96-(32+a×3)=49
(32+a×3)=96-49
32+a×3=47
a×3=47-32
a×3=15
a=15:3
a=5
96-(9×5-9×i)=5×6+57
96-(45-9×i)=30+57
96-(45-9×i)=87
(45-9×i)=96-87
45-9×i=9
9×i=45-9
9×i=36
i=36:9
i=4