Question 530301
This is pretty straightforward.  Your task is to understand how equations can be simplified.  If you look closely, you have:
...
a positive x term and a negative x term
a positive 3/x term and a negative 3/x term
a positive 5 and a negative 5
...
combining these terms altogether, they all cancel out
...and the equation = 0
...
cheers,
Lee