Question

x= (1/3)-(2/5)+(4/7)

Answer 1

x = 1  - 2  +  4
      3    5      7

105x = 35 - 42 + 60
 105              105

105x = 35 - 42 + 60
105x = - 7 + 60
105x = 53

x = 53
     105

3,5,7: 3
1,5,7: 5
1,1,7: 7
1,1,1   =   3.5.7 = 15.7 = 105