[(\frac{5}{6}x +2):8+0,25]:1\frac{1}{2}-3=7
(\frac{5}{48}x+\frac{1}{4}+\frac{1}{4}):\frac{3}{2}-3=7
(\frac{5}{48}x+\frac{1}{2})*\frac{2}{3}-3=7
\frac{5}{72}x+\frac{1}{3}-3=7
\frac{5}{72}x-2\frac{2}{3}=7
\frac{5}{72}x=7+2\frac{2}{3}
\frac{5}{72}x=9\frac{2}{3}
\frac{5}{72}x=\frac{29}{3}
x=\frac{29}{3}:\frac{5}{72}=\frac{29}{3}*\frac{72}{5}
x=139,2