Hi, 

Solving for a 

  (3a - 2) = (a+10)/(a+1)  

 (3a-2)(a+1) = a+10

  3a^2 +a -2 = a+10

  3a^2 = 12

   a^2 = 4

    a = ± 2

CHECKING our Answer***

 4 = 12/3

 -8 = 8/-1 

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