Question 704179
To clarify, the question seems to be 

{{{(x+8)/15=x/5}}}, find x.


Multiply rightside by {{{(3/3)}}}.
{{{(x+8)/15=3x/15}}}
The numerators are equal.


x+8=3x
8=3x-x
8=2x
{{{highlight(x=4)}}}