\(a.\dfrac{3}{7}:x=\dfrac{-9}{28}.\\ \Leftrightarrow x=\dfrac{3}{7}:\dfrac{-9}{28}=\dfrac{-4}{3}.\\ d.x-\dfrac{1}{2}=\dfrac{1}{3}+\dfrac{3}{4}.\\ \Leftrightarrow x-\dfrac{1}{2}=\dfrac{13}{12}.\\ \Leftrightarrow x=\dfrac{19}{12}.\\ f.\dfrac{5}{4}-x=\dfrac{1}{2}-\dfrac{7}{8}.\\ \dfrac{5}{4}-x=\dfrac{-3}{8}.\\ \Leftrightarrow x=\dfrac{13}{8}.\)
\(i.3\dfrac{2}{3}x+5\dfrac{1}{2}=11\dfrac{1}{6}.\\ \Leftrightarrow\dfrac{11}{3}x+\dfrac{11}{2}=\dfrac{67}{6}.\\ \Leftrightarrow\dfrac{11}{3}x=\dfrac{17}{3}.\\ \Leftrightarrow x=\dfrac{17}{11}.\)
\(a,\dfrac{3}{7}:x=\dfrac{-9}{28}\\ \Rightarrow x=-\dfrac{4}{3}\\ d,x-\dfrac{1}{2}=\dfrac{1}{3}+\dfrac{3}{4}\\ \Rightarrow x-\dfrac{1}{2}=\dfrac{13}{12}\\ \Rightarrow x=\dfrac{19}{12}\\ f,\dfrac{5}{4}-x=\dfrac{1}{2}-\dfrac{7}{8}\\ \Rightarrow\dfrac{5}{4}-x=-\dfrac{3}{8}\\ \Rightarrow x=\dfrac{13}{8}\\ i,3\dfrac{2}{3}x+5\dfrac{1}{2}=11\dfrac{1}{6}\\ \Leftrightarrow\dfrac{11}{3}x+\dfrac{11}{2}=\dfrac{67}{6}\\ \Rightarrow\dfrac{11}{3}x=\dfrac{17}{3}\\ \Rightarrow x=\dfrac{17}{11}\)
a: 3/7:x=-9/28
\(\Leftrightarrow x=\dfrac{3}{7}:\dfrac{-9}{28}=\dfrac{3}{7}\cdot\dfrac{-28}{9}=\dfrac{-4}{3}\)
d: x-1/2=1/3+3/4
=>x-1/2=4/12+9/12=13/12
=>x=13/12+1/2=13/12+6/12=19/12
f: 5/4-x=1/2-7/8
=>5/4-x=4/8-7/8=-3/8
=>x=5/4+3/8=10/8+3/8=13/8
\(a,x=\dfrac{3}{7}:\dfrac{-9}{28}\\ x=\dfrac{3}{7}\cdot\dfrac{-28}{9}\\ x=\dfrac{-3}{3}=-1\\ d,x-\dfrac{1}{2}=\dfrac{13}{12}\\ x=\dfrac{13}{12}+\dfrac{1}{2}\\ x=\dfrac{19}{12}\\ f,\dfrac{5}{4}-x=\dfrac{-3}{8}\\ x=\dfrac{5}{4}-\dfrac{-3}{8}\\ x=\dfrac{13}{8}\\ \\i,\dfrac{11}{3}x+\dfrac{11}{2}=\dfrac{67}{6}\\ \dfrac{11}{3}x=\dfrac{67}{6}-\dfrac{11}{2}\\ \dfrac{11}{3}x=\dfrac{17}{3}\\ x=\dfrac{17}{3}:\dfrac{11}{3}\\ x=\dfrac{17}{11}\)
