\(a.\dfrac{5}{4}+x=\dfrac{2}{3}.\Leftrightarrow x=\dfrac{2}{3}-\dfrac{5}{4}=\dfrac{-7}{12}.\)
\(b.x-\dfrac{2}{7}=\dfrac{7}{21}.\Leftrightarrow x=\dfrac{7}{21}+\dfrac{2}{7}=\dfrac{13}{21}.\)
\(c.\dfrac{5}{2}x-\dfrac{6}{2}=1.\Leftrightarrow\dfrac{5}{2}x=-2.\Leftrightarrow x=\dfrac{-4}{5}.\)
\(d.2x-\dfrac{3}{4}=\dfrac{-2}{3}.\Leftrightarrow2x=\dfrac{1}{12}.\Leftrightarrow x=\dfrac{1}{24}.\)
\(e.1\dfrac{2}{5}x+\dfrac{3}{7}=\dfrac{4}{5}.\Leftrightarrow\dfrac{7}{5}x=\dfrac{13}{35}.\Leftrightarrow x=\dfrac{13}{49}.\)
\(f.5\dfrac{1}{2}.x-\dfrac{5}{4}=1,5.\Leftrightarrow\dfrac{11}{2}x-\dfrac{5}{4}=\dfrac{3}{2}.\Leftrightarrow\dfrac{11}{2}x=\dfrac{11}{4}.\Leftrightarrow x=\dfrac{1}{2}.\)
\(g.\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}.\Leftrightarrow\dfrac{1}{4}:x=\dfrac{-7}{20}.\Leftrightarrow x=\dfrac{-5}{7}.\)
\(h.\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}.\Leftrightarrow\dfrac{2}{5}+x=\dfrac{1}{4}.\Leftrightarrow x=\dfrac{-3}{20}.\)
