exam Maths Puzzle Numerical Ability

How do you solve this exactly?

log(x+20)-log(x+2)=log x

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exam Other Question

Hello,
I have worked this problem out several times. I cannot seem to come up with the correct answer.
6ax+2a-15x-5
Can anyone help me?
Thanks! what is the product of x^2-x-6/x^2-3x+2 X 2x^2-6x+4/x^2-2x-3?