Add using horizontal method
a2 + 2ab + b2 and a2 - 2ab + b2
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a2 + 2ab + b2 + (a2 - 2ab + b2)
a2 + 2ab + b2 + a2 - 2ab + b2
a2 + a2 + 2ab - 2ab + b2 + b2
2a2 + 2b2
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