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X in (-oo:+oo)
2/3 = (12/2)*X // - (12/2)*X
2/3-((12/2)*X) = 0
2/3-6*X = 0
2/3-6*X = 0 // - 2/3
-6*X = -2/3 // : -6
X = -2/3/(-6)
X = 1/9
X = 1/9
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