Question 18134
Well...think about this, you are subtracting two fractions {{{5/x}}} and {{{3/x}}} and you'll notice that they have a common the denominator of x, so, you can just subtract the two fractions.

{{{5/x - 3/x = 3}}}
{{{(5-3)/x = 3}}}
{{{2/x = 3}}} Multiply both sides by x.
{{{2 = 3x}}} Finally, divide both sides by 3.
{{{2/3 = x}}}

The solution is {{{x = 2/3}}}

Check:  {{{5/(2/3) - 3/(2/3) = 15/2 - 9/2}}} = {{{(15-9)/2 = 6/2}}} = 3  OK.