Solve the equation A = 2LW + 2LH + 2WH for H.
AH = A - 2LW/2L + 2W
BH = A + 2LW/2L + 2W
CH = A - 2LW/4LW
DH = A/2L + 2W - 2LW
AH = A - 2LW/2L + 2W
BH = A + 2LW/2L + 2W
CH = A - 2LW/4LW
DH = A/2L + 2W - 2LW