(4a3-8a-4a2)+(7a3-7-6a)

Remove parentheses.

4a3-8a-4a2+7a3-7-6a

Add 4a3 and 7a3.

11a3-8a-4a2-7-6a

Subtract 6a from -8a.

11a3-14a-4a2-7

Add (4a^3-8a-4a^2)+(7a^3-7-6a)

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# Add (4a^3-8a-4a^2)+(7a^3-7-6a)

(4a3-8a-4a2)+(7a3-7-6a)

Remove parentheses.

4a3-8a-4a2+7a3-7-6a

Add 4a3 and 7a3.

11a3-8a-4a2-7-6a

Subtract 6a from -8a.

11a3-14a-4a2-7

Add (4a^3-8a-4a^2)+(7a^3-7-6a)