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(5*x-40)/6 = -7 // + 7
(5*x-40)/6+7 = 0
(5*x-40)/6+(6*7)/6 = 0
5*x+6*7-40 = 0
5*x+2 = 0
(5*x+2)/6 = 0
(5*x+2)/6 = 0 // * 6
5*x+2 = 0
5*x+2 = 0 // - 2
5*x = -2 // : 5
x = -2/5
x = -2/5
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