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Simplify x2 + 4x + 3x2 – 2x.

6x^6
4x^2 + 6x
4x^2 + 2x
4x^4 – 2x

Simplify a3 + a + 3a2 – a.

4a^7
a^3 + 3a^2 + 2a
a^3 + 3a^2
4a^5

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