book Maths Puzzle Numerical Ability

(7/4x)-(3/x)
_____________
(3/5)+(4/x)

I need help please. I am totaly lost.

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book Other Question

1) Determine the x and y intercepts of 3x-y=9.
Explain how you got it.

2)a) find the x and y intercepts for 3x=4y=12 and 2x=3y=9
b) use the intercepts to graph the system an John owns a hot dog stand. He has found that his profit is represented by the equation P=-x(squared)+70x=76, where P represents profits and x represents the number of hot dogs sold