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X in (-oo:+oo)
(X+1)/3 = 5 // - 5
(X+1)/3-5 = 0
(X+1)/3+(-5*3)/3 = 0
X-5*3+1 = 0
X-14 = 0
(X-14)/3 = 0
(X-14)/3 = 0 // * 3
X-14 = 0
X-14 = 0 // + 14
X = 14
X = 14
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