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[tex]\\ \rm\hookrightarrow \dfrac{BC}{AB}=\dfrac{CE}{ET}[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{4}{7}=\dfrac{8}{x}[/tex]
[tex]\\ \rm\hookrightarrow 4x=56[/tex]
[tex]\\ \rm\hookrightarrow ET=x=14[/tex]