Question 375993
Let n/d be the fraction.  Then by the given, d = n + 5, and {{{(n - 4)/(d + 3) = 1/5}}}.  By direct substitution, {{{(n - 4)/(n+5 + 3) = 1/5}}}, or
{{{(n-4)/(n + 8) = 1/5}}}.
5(n - 4) = n + 8, or
5n - 20 = n + 8, or
4n = 28, or
n = 7, and d = 12.  The original fraction is 7/12.