Answer:
d = 2
Step-by-step explanation:
5d - 10 - 2d + 5 = 7 + 5d - 10 - 3d
subtract 5d from both sides
5d - 5d - 10 - 2d + 5 = 7 + 5d - 5d - 10 - 3d
-10 - 2d + 5 = 7 - 10 - 3d
add 10 to both sides
-10 + 10 - 2d + 5 = 7 - 10 + 10 - 3d
-2d + 5 = 7 - 3d
add 3d to both sides
-2d + 3d + 5 = 7 - 3d + 3d
d + 5 = 7
subtract 5 from both sides
d + 5- 5 = 7 - 5
d = 7 - 5
d = 2
