Question 626687
Subtract lh from both sides to isolate w on the right:
S-lh=lw+wh<P>
If you need to, switch sides:
lw+wh=S-lh<P>
On the left, divide both terms by w:
w(l+h)=S-lh<P>
Divide both sides by l+h
w=(S-lh)/(l+h)
<P>
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