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5(1-x) - 3(1+x) = 6
----------------- -----
(1-x)(1+x) (11-x²)
5-5x-3-3x 6
------------ = --------
1-x² (11-x²)
2-8x 6
--------= -----
1-x² (11-x²)
2(1-4x)/1-x² = 6/(11-x²)