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X in (-oo:+oo)
(X-5)/4 = 1 // - 1
(X-5)/4-1 = 0
(X-5)/4+(-1*4)/4 = 0
X-1*4-5 = 0
X-9 = 0
(X-9)/4 = 0
(X-9)/4 = 0 // * 4
X-9 = 0
X-9 = 0 // + 9
X = 9
X = 9
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