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X in (-oo:+oo)
8 = (1/3)*X // - (1/3)*X
8-((1/3)*X) = 0
(-1/3)*X+8 = 0
8-1/3*X = 0 // - 8
-1/3*X = -8 // : -1/3
X = -8/(-1/3)
X = 24
X = 24
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