ln(x+8)+ln(x-5)=2 ln x
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This can be written: ln(x²+3x-40)=ln(x²).

So x²+3x-40=x², 3x=40, x=40/3. 

CHECK ln(64/3)+ln(25/3)=ln(8²5²/3²)=2ln(40/3)=2ln(x).


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