Question 1027487
21/(5x)-21/x=2


Put between triple left braces and triple right braces,
{{{21/(5x)-21/x=2}}}


Simplest common denominator is  5x.
Multiply the left member and the right member by  5x.


{{{5x(21/(5x)-21/x)=5x(2)}}}


Simplify!  Continue on to solve.