book Maths Puzzle Numerical Ability

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Wrtie as the sum or difference of single logarithms of x, y, and z

log(lowercase)8{(3x 3sqrt y) / z^5}

Note: the 3 is inside the

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Find all non-extraneous solutions
2x+1/x-3+3x+4/x=3x-2/x-3
Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar?