book Maths Puzzle Numerical Ability

solve for x: 3(x-4)-1=2x+5

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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/ Bicycling-The equation P=0.00267sF gives the power P (in horsepower) needed to keep a certain bicycle moving at speed s (in miles per hour), where F is the force of the road and ai