Question

2 3/5:(x+1 3/14)-1 2/5=1/3

Answer 1

2 3/5 /(х + 1 3/14 ) - 1 2/5 = 1/3       13/5  / (х + 17/14) - 7/5 = 1/3 , умножим левую и правую часть уравнения на 3(х + 17/14 ) , получим 
13/5 * 3 - 7/5 * 3 (х + 17/14) = 1(х + 17/14)
39/5 - 21/5х  - 51/10 = х + 17/14 
39/5 - 51/10  - 17/14 = х + 21/5 *х      546/70 -357/70 - 85/70 =26/5 *х
104/70 = 26/5*х        104 = 364х           х = 2/7