Respuesta :

8d - d - 4d - 8 = 5d....simplify (keep in mind, -d is the same as -1d)
3d - 8 = 5d.....subtract 3d from both sides
-8 = 5d - 3d
-8 = 2d ...divide both sides by 2
-8/2 = d....reduce
-4 = d