[tex]\frac{1+2,4}{x}=\frac{3}{3-1\frac{1}{2}}[/tex] <=> [tex]\frac{1+\frac{24}{10}}{x}=\frac{3}{3-\frac{3}{2}}<=>\frac{1+\frac{12}{5}}{x}=\frac{3}{\frac{3}{2}}[/tex] <=> [tex]\frac{\frac{17}{5}}{x}=\frac{3}{\frac{3}{2}}[/tex] <=> [tex]3x=\frac{17}{5}*\frac{3}{2}[/tex] <=> x=[tex]\frac{\frac{17}{5}*\frac{3}{2}}{3}=\frac{17}{5}*\frac{1}{2}=\frac{17}{10}[/tex]
