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Which equation could be used to find $AE$ in the diagram?

$\cfrac {8}{x}=\cfrac {7}{8}$

$\cfrac {7}{x}=\cfrac {8}{7}$

$\cfrac {8}{7}=\cfrac {8}{x+7}$

$\cfrac {8}{x}=\cfrac{x+7}{8}$

$\cfrac {8}{7}=\cfrac {8}{x}$