Question 24770
you need all the terms with h in on one side and all the other terms on the other side. So,


S=2wh+2wl+2lh
s - 2wh - 2lh = 2wl
-2wh - 2lh = 2wl - s


converting all signs gives 2wh + 2lh = s - 2wl


Now factorise, to give h(2w + 2l) = s - 2wl


And final answer is: {{{h = (s - 2wl)/(2w + 2l)}}}


jon.