(a * 13 + 117) : 2 = 91
(13а + 117) : 2 = 91
13а + 117/2 = 91
13а + 117 = 182
13а = 182 - 117
13а = 65
а = 5
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(a * 13 + 117) : 2 = 91
(13а + 117) : 2 = 91
13а + 117/2 = 91
13а + 117 = 182
13а = 182 - 117
13а = 65
а = 5