Выполните действия:
\(1)\ \frac{x}{4}+\frac{2x}{3};\)
\(2)\ \frac{5b}{14}-\frac{b}{7};\)
\(3)\ \frac{\vphantom{0}m}{8}-\frac{n}{6};\)
\(4)\ \frac{4}{x}-\frac{3}{y};\)
\(5)\ \frac{\vphantom{0}m}{4n}+\frac{m}{6n};\)
\(6)\ \frac{\vphantom{0}c}{b}-\frac{d}{3b};\)
\(7)\ \frac{a}{b^2}+\frac{1}{ab^4};\)
\(8)\ \frac{11}{5a}-\frac{2c}{15ab};\)
\(9)\ \frac{\vphantom{0}m}{abc}+\frac{c}{abm}.\)