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X in (-oo:+oo)
-6 = X+39/(-9) // - X+39/(-9)
-X-(39/(-9))-6 = 0
13/3-X-6 = 0
-X-5/3 = 0 // + 5/3
-X = 5/3 // * -1
X = -5/3
X = -5/3
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