In $∆\mathrm{ABC}$∆ABC, $\mathrm{D}$D and $\mathrm{E}$E are points on side $\mathrm{AB}$AB and $\mathrm{AC}$AC respectively such that $\mathrm{DE}\parallel\mathrm{BC}$DE∥BC and $\mathrm{AD}:\mathrm{DB}=3:1$AD:DB=3:1. If $\mathrm{EA}=3.3\mathrm{cm}$EA=3.3cm, then $\mathrm{AC}=$AC=
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