Answer:
25c+5d
Step-by-step explanation:
First, write out the equation as you have been given in the problem:
![5(3c-[d-2(c+d)])\\](https://tex.z-dn.net/?f=5%283c-%5Bd-2%28c%2Bd%29%5D%29%5C%5C)
Next, distribute the -2 to the set of parenthesis containing "c+d" and combine any like terms that you can:
![5(3c-[d-2c-2d])\\5(3c-[-2c-d])](https://tex.z-dn.net/?f=5%283c-%5Bd-2c-2d%5D%29%5C%5C5%283c-%5B-2c-d%5D%29)
Then, distribute the "-"to the "-2c-d" in the brackets and combine and like terms that you can:

Finally, distribute the coefficient 5 to the terms inside the parenthesis:

Therefore, 25c+5d is you simplified answer to the problem.