x-3/10=7/15.3/5
x-3/10=7/25
x=7/25+3/10
x=29/50
x - \(\dfrac{3}{10}\) = \(\dfrac{7}{15}\) . \(\dfrac{3}{5}\)
x - \(\dfrac{3}{10}\) = \(\dfrac{7}{25}\)
x = \(\dfrac{7}{25}\) + \(\dfrac{3}{10}\)
x = \(\dfrac{29}{50}\)
\(x-\dfrac{3}{10}=\dfrac{7}{25}\\ x=\dfrac{29}{50}\)
\(x-\dfrac{3}{10}=\dfrac{7}{5}.\dfrac{3}{5}\)
\(x-\dfrac{3}{10}=\dfrac{21}{25}\)
\(x=\dfrac{21}{25}+\dfrac{3}{10}\)
\(x=\dfrac{57}{50}\)
vậy x = ....