28-[19-{11-(7-6+?)}]=9
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let ? be x
28-[19-{11-(7-6+x)}]=9
28 = 9+[19-{11-(7-6+x)}]
28-9 = 19-{11-(7-6+x)}
19 = 19-{11-(7-6+x)}
19+{11-(7-6+x)}=19
11-(7-6+x)=19-19
11-(7-6+x) =0
11=7-6+x
11=1+x
x=10
28-[19-{11-(7-6+x)}]=9
28 = 9+[19-{11-(7-6+x)}]
28-9 = 19-{11-(7-6+x)}
19 = 19-{11-(7-6+x)}
19+{11-(7-6+x)}=19
11-(7-6+x)=19-19
11-(7-6+x) =0
11=7-6+x
11=1+x
x=10
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