Write Each Rational Expression in Lowest Terms, and Give the Domain

Essay

Write each rational expression in lowest terms, and give the domain.
(a) $\frac{3 x^{7}}{9 x^{9}}$
(b) $\frac{3 x+1}{9 x^{2}-1}$
(c) $\frac{x^{2}-2 x-3}{2 x^{2}-x-3}$