Question
Add the following expression:
$a^3 − 2b^3 + a, b^3 − 2a^3 + b$ and $− 2b + 2b^3 − 5a + 4a^3$
$a^3 − 2b^3 + a, b^3 − 2a^3 + b$ and $− 2b + 2b^3 − 5a + 4a^3$
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