X+5/12= 4/5
X = 4/5 - 5/12
X = 23/60
X x2/5=7/9
X = 7/9 : 2/5
X= 35/18
\(=>x=\left(\dfrac{4}{3}\times\dfrac{3}{5}\right)-\dfrac{5}{12}=\dfrac{4}{5}-\dfrac{5}{12}=\dfrac{23}{60}\)
\(=>x=\left(\dfrac{7}{11}\times\dfrac{11}{9}\right):\dfrac{2}{5}=\dfrac{7}{9}\times\dfrac{5}{2}=\dfrac{35}{18}\)