HELP ME YOU MUST EXPLAIN THE ANSWER ​

Answer: 4) 7c ^2d - 7c + 4d - 10Explanation:First write equastion as seen:5c^2d - 4c + 3d - 3 + 2c^d - 3c+ d - 7Next add the c^2d’s together:7c^2d - 4c + 3d - 3 + 3c + d - 7Add the c’s together:7c^2d - 7c + 3d - 3 + d - 7Add the d’s:7c^2d - 7c + 4d - 3 - 7Lastly add the normal numbers:7c^2d - 7c + 4d - 10Thus, that is your answer!Hope this helps! :)