Answer:
d = -9
Step-by-step explanation:
-2 - 9d = -10d - 9 (combine liked terms)
+2 +2 (added two to each side)
-9d = -10d - 9 (combined liked terms again for d this time)
+10d +10d
1d = -9 (isolate x so divde one from each side)
