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d in (-oo:+oo)
(20-d)/(-19) = 8 // - 8
(20-d)/(-19)-8 = 0
(20-d)/(-19)+(-19*(-8))/(-19) = 0
20-d-19*(-8) = 0
172-d = 0
(172-d)/(-19) = 0
(172-d)/(-19) = 0 // * -19
172-d = 0
172-d = 0 // - 172
-d = -172 // * -1
d = 172
d = 172
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