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x in (-oo:+oo)
(2/3)*x+x = (5/3)*x // - (5/3)*x
(2/3)*x+x-((5/3)*x) = 0
(2/3)*x+x+(-5/3)*x = 0
0 = 0
x naleu017Cy do R
x in (-oo:+oo)
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