book Maths Puzzle Numerical Ability

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/

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book Other Question

what do you mean when you say -2x+14-4+-2-7+5 solve for x: 3(x-4)-1=2x+5