a)\(2x-3=\frac{1}{2}\Leftrightarrow2x=\frac{1}{2}+3\Leftrightarrow2x=\frac{7}{2}\Leftrightarrow x=\frac{7}{2}\div2\Leftrightarrow x=\frac{7}{4}\)
b)\(\frac{5}{12}x=\frac{-4}{15}\Leftrightarrow x=\frac{-4}{15}\div\frac{5}{12}\Leftrightarrow x=\frac{-6}{25}\)
c)\(2,7:2x=\frac{11}{5}:\frac{11}{3}\Leftrightarrow2,7:2x=\frac{3}{5}\Leftrightarrow2x=2,7:\frac{3}{5}\Leftrightarrow2x=4,5\Leftrightarrow x=4,5:2\Leftrightarrow x=2.25\)