Find the antiderivative of the following equation, simplifying as much as possible.
5x^2 + 3x
1/6x^2 * (10x + 9) + C, where C is a constant.
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### Instruction:
Find the antiderivative of the following equation, simplifying as much as possible.

### Response:
1/6x^2 * (10x + 9) + C, where C is a constant.