book Maths Puzzle Numerical Ability

Find all values of w satisfying the equation:

3w/w - 2 = negative 27/w^2 - 8w + 12

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book Other Question

The perimeter of a rectangle is 50ft. The width of a rectangle is 5ft. less than the length. Find the length and the width of the rectangle. P = 2w +2L I need to evalute the expression:

y^4/9(y^-4/9 + 4y ^5/9)

any help with this,i cant make sense of it or solve it. I need to multiply and assume all numbers are positive.

Thanks for your help