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x in (-oo:+oo)
(2/3)*x = (2/3)*x-4 // - (2/3)*x-4
(2/3)*x-((2/3)*x)+4 = 0
(2/3)*x+(-2/3)*x+4 = 0
4 = 0
x belongs to the empty set
x belongs to the empty set
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