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5+[16-(9:a*15)]*6 = 4:2+9

Răspuns :

5+[16-(9:a*15)]*6=11
[16-(9:a*15)]*6=11-5
[16-(9:a*15)]*6= 6
16-(9:a*15)=6:6
16-(9:a*15)=1
9:a*15=16-1
9:a*15=15
9:a=15:15
9:a=1
a=9*1
a=9
R:S={9}