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

Answer

$(a^3 − 2b^3 + a) + (b^3 − 2a^3 + b) + (− 2b + 2b^3 − 5a + 4a^3)$
$= a^3− 2b^3 + a + b^3 − 2a^3 + b − 2b + 2b^3 − 5a + 4a^3$
$= a^3 + 4a^3 − 2a^3 − 2b^3+ b^3 + 2b^3 + a − 5a + b − 2b$
$= 3a^3 + b^3 − 4a − b$

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