Question 921095
2+s -3/7 = 6/7
   add 3/7 on both sides
 2+s-3/7 +3/7 = 6/7+3/7
    2+s=0 = (6+3)/7
   2+s = 9/7
        subtract 2 on both sides
        2+s-2 = 9/7-2
        s  = 9/7 -2
        s = 9/7 -2*(7/7)
       s= 9/7 -14/7
         s= (9-14)/7
         s =(-5)/7
        s= -7/5