Answer
h = $\frac{S - 4lw}{2w}$
Work Step by Step
Solve for h by isolating it to one side:
S = 4lw + 2wh
Subtract 4lw:
S - 4lw = 2wh
Divide both sides by 2w:
$\frac{S - 4lw}{2w}$ = h
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