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*4/A=8/C--->4C=8A--->C=8A/4
Reemplazamos en :BC=504
*_(7A/4)(8A/4)=504
_56A²/16=504
Simplificamos
_7A²/2=504
_7A²=(2)504
_7A²=1008
_A²=1008/7
_A=√144
_A=12
Espero te haya servido :)