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X in (-oo:+oo)
(X-5)/3 = 15 // - 15
(X-5)/3-15 = 0
(X-5)/3+(-15*3)/3 = 0
X-15*3-5 = 0
X-50 = 0
(X-50)/3 = 0
(X-50)/3 = 0 // * 3
X-50 = 0
X-50 = 0 // + 50
X = 50
X = 50
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