Compare methods of solving linear equations and methods of solving linear inequalities. what do they have in common? what is different?

Plz which expression is equivalent to the expression below?

John bought 2 horses at rs 20000 each

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.