book Maths Puzzle Numerical Ability

I need to solve this inequality 5 different ways. ax+b<c and x<24. I thought I had it once but can't get it to work now. Help please.

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book Other Question

Solve for x: 7x/x-2 + 2x/x+2 =9 I thought you would use (x-2)(X+2) as your LCD, But I can't seem to come up with an answer after I do that. I keep coming up with 7x+2x=9(x-2)(X+ Please help!!
(1/64)^2/3=?