exam Maths Puzzle Numerical Ability

I need help with simplifying:
3/x+1 + 3
/ divided by 3x/x-1 -3.

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exam Other Question

How do I write an equation of a line with
a slope of -2 and y interecept (0,0).

Thanks Calcalate the value for z which

2log3(Y)-log3(y+4)= 2