Which equation shows a valid step in solving 3/2x-6 + 3/2x+6 = 0?

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

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.

Explain how you do each step what term makes it inconsistent y=2x - 4 ?