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(57*x-87)/18 = -27 // + 27
(57*x-87)/18+27 = 0
(57*x-87)/18+(18*27)/18 = 0
57*x+18*27-87 = 0
57*x+399 = 0
(57*x+399)/18 = 0
(57*x+399)/18 = 0 // * 18
57*x+399 = 0
57*x+399 = 0 // - 399
57*x = -399 // : 57
x = -399/57
x = -7
x = -7
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