\(b,\left(x+\dfrac{1}{4}\right):\dfrac{3}{7}=\dfrac{1}{6}\\ \Rightarrow x+\dfrac{1}{4}=\dfrac{1}{14}\\ \Rightarrow x=-\dfrac{5}{28}\\ e,\left(\dfrac{3}{15}-x\right).\dfrac{1}{3}=\dfrac{2}{-5}\\ \Rightarrow\dfrac{3}{15}-x=-\dfrac{6}{5}\\ \Rightarrow x=\dfrac{7}{5}\\ h,\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}+\dfrac{5}{7}=9\dfrac{5}{7}\\ \Rightarrow\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}=9\\ \Rightarrow x-\dfrac{1}{2}=3\\ \Rightarrow x=\dfrac{7}{2}\)
\(l,x-\dfrac{2}{5}=\dfrac{-1}{3}:\dfrac{25}{6}\\ \Rightarrow x-\dfrac{2}{5}=-\dfrac{2}{25}\\ \Rightarrow x=\dfrac{8}{25}\)
\(b.\left(x+\dfrac{1}{4}\right):\dfrac{3}{7}=\dfrac{1}{6}.\\ \Leftrightarrow x+\dfrac{1}{4}=\dfrac{1}{14}.\\ \Leftrightarrow x=\dfrac{-5}{28}.\)
\(e.\left(\dfrac{3}{15}-x\right).\dfrac{1}{3}=\dfrac{2}{-5}.\\ \Leftrightarrow\dfrac{3}{15}-x=\dfrac{-6}{5}.\\ \Leftrightarrow x=\dfrac{7}{5}.\)
\(h.\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}+\dfrac{5}{7}=9\dfrac{5}{7}.\\\Leftrightarrow\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}+\dfrac{5}{7}=\dfrac{68}{7}.\\ \Leftrightarrow\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}=9.\\ \Leftrightarrow x-\dfrac{1}{2}=3.\\ \Leftrightarrow x=\dfrac{7}{2}.\)
\(l.x-\dfrac{2}{5}=\dfrac{-1}{3}:\dfrac{-25}{6}.\\ \Leftrightarrow x-\dfrac{2}{5}=\dfrac{2}{25}.\\ \Leftrightarrow x=\dfrac{12}{25}.\)
b: =>x+1/4=1/6:3/7=1/6x7/3=7/18
=>x=7/18-1/4=14/36-9/36=5/36
e: \(\Leftrightarrow\dfrac{3}{15}-x=\dfrac{-2}{5}:\dfrac{1}{3}=\dfrac{-6}{5}\)
\(\Leftrightarrow x=\dfrac{1}{5}+\dfrac{6}{5}=\dfrac{7}{5}\)
h: \(\Leftrightarrow\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}=9\)
=>x-1/2=27
hay x=55/2
