Bonjour,

A = (x+3)/4 - (3x-2)/4

   = (x+3-3x+2)/4

   = (-2x+5)/4

   = -x/2 + 5/4

B = (2x+5)/3 + (x-2)/2

  = (2(2x+5))/6 + (3(x-2))/6

  = (4x+10+3x-6)/6

  = (7x+4)/6

  = 7x/6 + 2/3