\(3-3x-\left(\dfrac{5}{4}-\dfrac{7}{5}\right)=\dfrac{9}{20}\)
\(3-3x-\dfrac{-3}{20}=\dfrac{9}{20}\)
\(3x-\dfrac{-3}{20}=3-\dfrac{9}{20}\)
\(3x-\dfrac{-3}{20}=\dfrac{51}{20}\)
\(3x=\dfrac{51}{20}-\left(\dfrac{-3}{20}\right)\)
\(3x=\dfrac{27}{10}\)
\(x=\dfrac{27}{10}:3\)
\(x=\dfrac{27}{10}.\dfrac{1}{3}\)
\(x=\dfrac{9}{10}\)
\(3-3x-\left(\dfrac{5}{4}-\dfrac{7}{5}\right)=\dfrac{9}{20}\)
\(3-3x-\left(\dfrac{25}{20}-\dfrac{28}{20}\right)=\dfrac{9}{20}\)
\(3-3x-\dfrac{-3}{20}=\dfrac{9}{20}\)
\(3-3x=\dfrac{9}{20}+\dfrac{-3}{20}=\dfrac{6}{20}=\dfrac{3}{10}\)
\(3x=3-\dfrac{3}{10}=\dfrac{30}{10}-\dfrac{3}{10}=\dfrac{27}{10}\)
\(x=\dfrac{27}{10}:3=\dfrac{27}{10}.\dfrac{1}{3}\)
\(x=\dfrac{27}{30}=\dfrac{9}{10}\)
