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Sagot :

J = (3 + 3/7 x)(7x -14)
(21/7 + 3/7 x) ( 7x -14)
147x - 294x  21x²  -42x 
  7       7       7       7
147x -42x - 294 +21 x²
21x² 105x -294 = 3x² 15x 42
           7 

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