Answer:
d>9
Explanation:
You need to do inverse operations to isolate the variable (d)
3d-6>21
get ride of the six by doing its inverse. The opposite of subtraction is addition so you'd add 6 to both sides. this moves the six to the other side of the inequality sign
3d>27
now that the variable is isolated the final step is to divide by the coefficient (3). 3/3 is 1, effectively giving you d, and 27/3=9
d>9
in this case you do not flip the sign as you did not divide by a negative