Answer:
10x^3 + x - 1
Explanation:
(6x^3 -7x - 4) + (4x^3 + 8x + 3)
Combine like terms
6x^3 + 4x^3 = 10x^3
-7x + 8x = x
-4 + 3 = -1
Combine the results of the terms
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