exam Maths Puzzle Numerical Ability

Draw the graph of this equation:y=1/3x-3

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Getting stuck/confused on problems 19, 27, & 29, pg. 479, algebra 1 glencoe, book.
I have the answers, but am having a difficult time coming up with what they have.
Can you expla find x
-3log(x+2)+log5=0

The answer is -2+cube root of 5

What steps are involved in getting to that answer?