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(a+b)³ - 8(a-b)³
a³+b³+3a³b+3ab²-8(a³-b³-3a²b+3ab²)
a³+b³+3a³b+3ab²-8a³+8b³+24a²b-24ab²
-7a³+9b³+27a²b-21ab²
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