Answer:
c = 9 - 17d
Step-by-step explanation:
9-c = 17d
9-c+c= 17d + c (add c to both sides)
9 = 17d + c (Simplify)
9 - 17d = 17d - 17d + c (subtract 17d from both sides)
9 - 17d = c (Simplify)
First, factor each expression by finding two terms whose product is equal to the c term and sum is equal to the b term.
x^2-x+6 --> (x-3)(x+2)
x^2-4 --> (x+2) (x-2)
Next, cancel the terms that are equal on the top and bottom.
You are left with the answer of: 
Hope this helps!!
The answer is 3620.0000000000004
.0018529956763434 is my calculated answer.<span />