Add: a ^ 3 * b * (a ^ 2 - 2a + 3) and 2ab * (a ^ 3 + a ^ 2 + 3) .
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Answer
We need to subtract 2a−b from 3a−b
It can be written as 3a−b−(2a−b)
=3a−b−2a+b
=a
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