book Maths Puzzle Numerical Ability

4(x-2)+5(3x-4)=0
How do you figure out what x is?

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Please help me on this problem
solve for x
4/x+3 -1/x^2-5x-24=3/x-8
this is what i have so far:
(x+3)(x-8)4/x+3 -1(x+3)(x-8)/(x+3)(x-8)=3(x+3)(x-8)/x-8
i know that the like terms cancel but i dont know what should be the denominator Suppose W varies directly as x and y and inversely as Z, and W=48 when X=2, Y=8 and Z=12. Find W when X=12, Y=6 and Z=24.