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Full proof without mind cuts :]
(just copied and added few more lines)
Start with: -20 = -20
Which is the same as: 16-36 = 25-45
Which can also be expressed as: (2+2)^2 - 9 x (2+2) = 5^2 - 9 x 5
Add 81/4 to both sides: (2+2)^2 - 9(2+2) + 81/4 = 5^2 - 9 x 5 + 81/4
Rearrange the terms: [(2+2)-...
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