7th grade Math Which expression is equivalent to the given expression?

5x−2=

2−5x

2x−2+3x

3−5+2x

5x−2x

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Ze trinomial x2 + bx – c has factors of (x + m)(x – n), where m, n, and b are positive. what is ze relationship between the values of m and n? explain how you got ze answer