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x in (-oo:+oo)
(6*(2/1))/18 = x // - x
(6*(2/1))/18-x = 0
(2*6)/18-x = 0
2/3-x = 0 // - 2/3
-x = -2/3 // * -1
x = 2/3
x = 2/3
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