book Maths Puzzle Numerical Ability

1/2d+3/8=-2d

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book Other Question

Please help me solve this problem involving positive exponents.

The problem is a fraction problem with negative exponents that are then raised to another negative exponent. Y^-7 divided by Y^-2 to the -2^.
I need help solving this equation:

{{{9x^(-4/3)+32x^(-2/3)=16}}}

At first I tried substituting y for {{{x^(-2/3)}}} so I ended up with {{{9y^2+32y-16=0}}}. I ended with y= 4/