Find the integral of (x² - x + 42)/(x³ + 7x)dx. Which of the following options represents the correct solution?
A) ∫(x² - x + 42)/(x³ + 7x)dx
B) ∫(x² - x + 42)/(x³ + 7x²)dx
C) ∫(x² - x + 42)/(x^4 + 7x)dx
D) ∫(x² - x + 42)/(x^4 + 7x²)dx