factorise 1/x-1 - 1/x+1 =6/7
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=> 1/x-1 - 1/x+1 = 6/7
=> (x+1)-(x-1)/(x-1)(x+1) = 6/7
=> x+1-x+1/x²-1 = 6/7
=> 6x²- 6 = 14
=> 6x² = 20
=> x² = 20/6
=> x = √10/3 ans.
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