Finding Indefinite Integrals In Exercises 29–32, find the most general antiderivative or indefinite

Chapter 4.8 Antiderivatives Ex29-32
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Finding Indefinite Integrals In Exercises 25–70, find the most general antiderivative or indefinite integral. You may need to try a solution and then adjust your guess. Check your answers by differentiation.
29. ∫(2x^3 - 5x + 7) dx
30. ∫(1 - x^2 - 3x^5) dx
31. ∫(1/x^2 - x^2 - 1/3)dx
32. ∫(1/5 - 2/x^3 + 2x)dx