exam Maths Puzzle Numerical Ability

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!

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exam Other Question

Assume that y varies inversely as x, and y=18 when x=3. Find the constant of variation.

Please help!
How do you solve this exactly?

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