如图,在\(\triangle ABC\)中,\(DE/\!/AB\),\(DE\)分别与\(AC\),\(BC\)交于\(D\),\(E\)两点\(.\)若\(\dfrac{{{S}_{\vartriangle DEC}}}{{{S}_{\vartriangle ABC}}}=\dfrac{4}{9}\), \(AC=3\),则\(DC=\)___.
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