\(\frac{x-3}{4}=\frac{3x-11}{10}=\frac{3}{20}\)
\(\Leftrightarrow\frac{5\left(x-3\right)}{20}-\frac{2\left(3x-11\right)}{20}=\frac{3}{20}\)
\(\Leftrightarrow\frac{5x-15}{20}-\frac{6x-22}{20}=\frac{3}{20}\)
=> 5x - 15 - 6x + 22 =3
<=>5x - 6x = 15 - 22 + 3
<=> - x = 4
<=> x = 4