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x in (-oo:+oo)
(86-y)/2 = x // - x
(86-y)/2-x = 0
(86-y)/2+(2*(-x))/2 = 0
2*(-x)-y+86 = 0
86-2*x-y = 0
(86-2*x-y)/2 = 0
(86-2*x-y)/2 = 0 // * 2
86-2*x-y = 0
86-2*x-y = 0 // - 86-y
-2*x = -(86-y) // : -2
x = (-(86-y))/(-2)
x = (y-86)/(-2)
x = (y-86)/(-2)
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