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1+{2x[3+(4+y):5]-6}x7=29

Răspuns :

1+{2x[3+(4+y):5]-6}x7=29
{2x[3+(4+y):5]-6}x7=29-1 -->28
2x[3+(4+y):5]-6=28:7 -->4
[3+(4+y):5]-6=4:2 --> 2
3+(4+y):5=2+6 --> 8
(4+y):5=8-3 --> 5
4+y=5x5 --> 25
   y=25-4
   y=21