The difference between an equation and an expression would be that an algebraic expression simply as the variables, constants, numerals, and operation signs. Whereas the equation is the expression as well as the answer with it such as; an expression 6 + x and the equation would be 6+x=15. X=9 One can simply tell the difference because an equation has an equal sign where it is not present in an expression. You cannot solve a variable in an expression because the variable is always changing so one must know what the variable stands for. Such as, 2x+66 (one would not be able to solve due to not know what “x” stands for). But in an equation one would be able to solve: if x=15 then one could solve such as (2)15+66=96.