<PRE><B>Question 1106324</B>
S = 2lw+2lh+2wh
Isolate terms with w in them
s-2LH=2LW+2WH
factor
s-2LH=2W(L+H)
divide by 2 (L+H)
(s-2LH)/2(L+H)=w ANSWER
check
let l=8, w=6 h=4
S=2(48)+2(32)+2(24)=96+64+48=208 units
s-2LH=208-64=144
divided by 2(L+H)=2(12)=24
144/24=6, which is w. </PRE>