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X in (-oo:+oo)
(X-15)/4 = -6 // + 6
(X-15)/4+6 = 0
(X-15)/4+(4*6)/4 = 0
X+4*6-15 = 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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