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X in (-oo:+oo)
(2/3)*X = 6-(1/3) // - 6-(1/3)
(2/3)*X+1/3-6 = 0
2/3*X-17/3 = 0 // + 17/3
2/3*X = 17/3 // : 2/3
X = 17/3/2/3
X = 17/2
X = 17/2
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