Tìm x, biết:

\(a,\dfrac{1}{3}:\left(2x-1\right)=\dfrac{-1}{6}\)

\(b,\left(3x+2\right)\left(\dfrac{-2}{5}x-7\right)=0\)

\(c,\dfrac{x}{8}=\dfrac{9}{4}\)

\(d,\dfrac{x-3}{2}=\dfrac{18}{x-3}\)

\(e,4,5x-6,2x=6,12\)

\(h,11,4-\left(x-3,4\right)=-16,2\)

Tính:

a, \(\dfrac{3}{5}+\dfrac{-4}{9}\)              b, \(\dfrac{3}{5}+\dfrac{2}{5}.\dfrac{15}{8}\)   

c, \(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}\) 

d, \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}\)