Answer :
0.5d - 3d + 5 = 0
-2.5d + 5 = 0 |subtract 5 from both sides
-2.5d = -5 |divide both sides by (-2.5)
d = 2
-2.5d + 5 = 0 |subtract 5 from both sides
-2.5d = -5 |divide both sides by (-2.5)
d = 2