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X in (-oo:+oo)
(X-1)/4-3 = 0
(X-1)/4+(-3*4)/4 = 0
X-3*4-1 = 0
X-13 = 0
(X-13)/4 = 0
(X-13)/4 = 0 // * 4
X-13 = 0
X-13 = 0 // + 13
X = 13
X = 13
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