Intermediate Algebra (6th Edition)

$H=\frac{S-2LW}{2L+2W}$
We are given that $S=2LW+2LH+2WH$. We can solve for H by first subtracting 2LW from both sides. $S-2LW=2LH+2WH$ We can use the distributive property to factor out H from both terms on the right side. $S-2LW=H(2L+2W)$ Divide both sides by 2L+2W. $H=\frac{S-2LW}{2L+2W}$