\(x-\frac{3}{10}=\frac{120}{30}\)
\(\Rightarrow x-\frac{12}{40}=\frac{120}{40}\)
\(\Rightarrow x=\frac{120}{40}+\frac{12}{40}\)
\(\Rightarrow x=\frac{152}{40}\)
\(=>x-\frac{3}{10}=\frac{120}{40}\\ =>x=\frac{120}{40}+\frac{3}{10}\\ =>x=\frac{132}{40}\\ =>x=\frac{33}{10}\)
\(x-\frac{3}{10}=\frac{120}{40}\)
\(x-\frac{3}{10}=\frac{1}{3}\)
\(x=\frac{1}{3}+\frac{3}{10}\)
\(x=\frac{10}{30}+\frac{9}{30}\)
\(x=\frac{19}{30}\)