Answer:
d = -2
Step-by-step explanation:
2d + 4 = 10 + 5d
2d - 2d + 4 = 10 + 5d - 2d
4 = 10 + 3d
4 - 10 = 10 - 10 + 3d
-6 = 3d
(1/3) -6 = 3d (1/3)
-2 = d