1. Camilie answered it right.
Charlize added the 4, she was not suppose to add the four in the first step. she was suppose to subtract like camilie did.
2. The right answer is 2mr+q=p
2m=p-q(r)/r (r)
2mr=p-q
+q +q
--------------------
2mr+q=p
Hope you can understand the second one.