exam Maths Puzzle Numerical Ability

I'm hoping that's the correct subject area. My question says 2x+2/10x^2+16x+6 Simplify the expression. Where as 2x+2 are both over all of 10x^2+16x+6. I have the answer, which i

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This is really stumping me can you help?
Use common logarithms and a calculator to evaluate to four decimal places:
log612 (it is a lower six)

Thanks in advance
13x=77+2x