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27:[26+(6x5-7xa):9]=1

Răspuns :

27: [26 + (6 x 5 - 7 x A) : 9] = 1
26 + (6 x 5 - 7 x A) : 9 = 27 : 1 = 27
(6 x 5 - 7 x A) : 9 = 27 - 26 = 1
6 x 5 - 7 x A = 1 x 9 = 9
30 - 7 x A = 9
7 x A = 30 - 9 = 21
A = 21 : 7
A = 3