SA=2(lw+hw+hl)w

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Solution for SA=2(lw+hw+hl)w equation: 


Simplifying
SA = 2(lw + hw + hl) * w

Reorder the terms:
AS = 2(hl + hw + lw) * w

Reorder the terms for easier multiplication:
AS = 2w(hl + hw + lw)
AS = (hl * 2w + hw * 2w + lw * 2w)
AS = (2hlw + 2hw2 + 2lw2)

Solving
AS = 2hlw + 2hw2 + 2lw2

Solving for variable 'A'.

Move all terms containing A to the left, all other terms to the right.

Divide each side by 'S'.
A = 2hlwS-1 + 2hw2S-1 + 2lw2S-1

Simplifying
A = 2hlwS-1 + 2hw2S-1 + 2lw2S-1

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