The solutions for the antiderivatives are:
- \( y = C_1 + \frac{1}{x} \)
- \( y = C_2 + x + \frac{1}{x} \)
- \( y = C_3 + 6x - \frac{1}{x} \)
Thus, the final answers are:
\[
\boxed{y = C_1 + \frac{1}{x}, \quad y = C_2 + x + \frac{1}{x}, \quad y = C_3 + 6x - \frac{1}{x}}
\]