Решите уравнения:а)7/30+x=11/30;б)y+1/13=6/13;в)z-4/25=10/25;г)18/40-t=9/40.

а) 7/30 + x = 11/30

   x = 11/30 - 7/30

   x = 4/30 = 2/15

б) y + 1/13 = 6/13

   y = 6/13 - 1/13

   y = 5/13

в) z - 4/25 = 10/25

   z = 10/25 + 4/25

   z = 14/25

г) 18/40 - t = 9/40

   - t = 9/40 - 18/40

   - t = - 9/40

    t = 9/40