Question 65428
Find x : 

m/c - 3a + c/x = f

The LCD is cx, multiply everthing by cx to clear the fractions:
{{{cx(m/c)-cx(3a)+cx(c/x)=cx(f)}}}
{{{mx-3acx+c^2=cfx}}}
{{{mx-3acx-cfx+c^2=cfx-cfx}}}
{{{mx-3acx-cfx+c^2=0}}}
{{{mx-3acx-cfx+c^2-c^2=0-c^2}}}
{{{mx-3acx-cfx=-c^2}}}
{{{x(m-3ac-cf)=-c^2}}}
{{{x(m-3ac-cf)/(m-3ac-cf)=-c^2/(m-3ac-cf)}}}
{{{x=c^2/(3ac+cf-m)}}}
Happy Calculating!!!