exam Maths Puzzle Numerical Ability

subtract and simplify please show all steps:2/(x=1)-3/(x-3)

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exam Other Question

Can someone help me with this problem?
I need to add this:

1/3 + (-5/6) + (-1/2)

Thanks,
Sher Find the center and radius of the circle whose equation is given.
5x2 + 5y2 + 40x + 115 = 40y