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   ( 2X + 3 ) ^2 - ( 1 - X ) ( 3X +2 ) ^2 = 0
 
   4X^2 + 12X + 9 - ( 1 -X) ( 9X^2 + 12X + 4 ) =0
 
   4 X^2 + 12 X + 9 - ( 9X^2 + 12X +4 - 9X^3 -12X^2 - 4X)
 
     4X^2 + 12X + 9 - 9X^2 -12X -4 + 9X^3 + 12 X^2 +4x 
 
      9 X^3 + 7 X^2 +4 X +5