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X in (-oo:+oo)
(X^1)/6-((X^1)/3) = -2 // + 2
(X^1)/6-((X^1)/3)+2 = 0
X/6-(X/3)+2 = 0
2-1/6*X = 0 // - 2
-1/6*X = -2 // : -1/6
X = -2/(-1/6)
X = 12
X = 12
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