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X in (-oo:+oo)
(X-5)/2-4 = 9 // - 9
(X-5)/2-9-4 = 0
(X-5)/2+(-9*2)/2+(-4*2)/2 = 0
X-9*2-4*2-5 = 0
X-23-8 = 0
X-31 = 0
(X-31)/2 = 0
(X-31)/2 = 0 // * 2
X-31 = 0
X-31 = 0 // + 31
X = 31
X = 31
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