Question 1135292
if you have:

{{{A=(1/2)w(b+c)}}} for {{{c}}}

{{{A/(w/2)=(b+c)}}} 

{{{2A/w=b+c}}} 

{{{c=2A/w-b}}} 



if you have:

{{{A=(1/2w)(b+c)}}} for {{{c}}}

{{{A/(1/2w)=(b+c)}}}

{{{2wA=b+c}}}

{{{c=2wA-b}}}



if you have:

{{{A=1/(2w(b+c))}}} for {{{c}}}

{{{2w(b+c)=1/A}}} 

{{{b+c=1/2wA}}} 

{{{c=1/2wA-b}}}