Question 384122
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Hi,         
 {{{4/(a+2) - 6/(a-2) = 6/(a^2 - 4)}}} 
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