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X in (-oo:+oo)
(2/3)*X-2 = (-2/3)*X-4 // - (-2/3)*X-4
(2/3)*X-((-2/3)*X)-2+4 = 0
(2/3)*X+(2/3)*X-2+4 = 0
4/3*X+2 = 0 // - 2
4/3*X = -2 // : 4/3
X = -2/4/3
X = -3/2
X = -3/2
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