Question 1164326
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{{{M=((L)/(F))((25)/(f)+1)}}}<br>
Distribute on the right<br>
{{{M=((25L)/(Ff))+L/F}}}<br>
Isolate the term containing f<br>
{{{M-L/F=((25L)/(Ff))}}}
{{{(MF-L)/F=((25L)/(Ff))}}}
{{{(MF-L)=((25L)/f)}}}<br>
Take reciprocals<br>
{{{1/(MF-L)=f/(25L)}}}
{{{(25L)/(MF-L)=f}}}<br>