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(x+12*x+13)/6 = 115 // - 115
(x+12*x+13)/6-115 = 0
(13*x+13)/6-115 = 0
(13*x+13)/6+(-115*6)/6 = 0
13*x-115*6+13 = 0
13*x-677 = 0
(13*x-677)/6 = 0
(13*x-677)/6 = 0 // * 6
13*x-677 = 0
13*x-677 = 0 // + 677
13*x = 677 // : 13
x = 677/13
x = 677/13
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