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I f   t h e   v e r t e x   a n d   f o c u s   o f   a   p a r a b o l a   a r e   ( 3 , 3 )   a n d   ( - 3 , 3 )   r e s p e c t i v e l y , t h e n   i t s   e q u a t i o n   i s : ( a )   x 2 - 6 x + 24 y - 63 = 0 ( b )   x 2 - 6 x + 24 y + 81 = 0 ( c )   y 2 - 6 y + 24 x - 63 = 0 ( d )   y 2 - 6 y - 24 x + 81 = 0

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