Hi,         

  

Multiplying each term by (a^2-4) Or as factored(a-2)(a+2)

  4(a-2) - 6(a+2) = 6

  4a -8 - 6a - 12 = 6

      -26 = 2a 

        -13 = a



CHECKING our Answer

  -4/11 + 6/15 = 66/165 - 60/165 = 6/165

 

   

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