Question

  3x/5 - 1/2 = x-2/5 ?

   x/2 +3/4 = 2x/6 - 1/3 ?

   3y/2 - 1 = 3/4 -2y ?

   3/2x - 4/5 =2x ?

    3/4 -y/6 = y/8 - 1/3 ?

Answer 1

3x/5   - 1/2 =  x  - 2/5 tira MMC de 5, 2 = 10
6x  - 5  = 2x  - 4
6x -2x = -4 +5
2x = 1
 x= 1/2

x/2 +  3/4 = 2x/6 - 1/3     MMC de (   2 , 4, 6 e 3 = 12)
6x + 9 = 4x - 4
6x - 4x = - 4 - 9
2x = -13
 x = - 13/2

3y /2  - 1 = 3/4 - 2y    MMc de (2 e 4 = 4)
6 y  - 4 = 6 - 8y
6y + 8y = 6 + 4
14y = 10
  y = 10/14 = 5/7

3/4 - y/6 =   y/ 8 - 1/3      MMc de ( 4,6,8,3=24)
18  - 4y = 3y - 8
-4 y -3y = -8 -18
-7y = - 26      x( -1)
7y = 26
 y = 26/7