Is 2(2x-4)+8y+10-2y an expression to be simplified or an equation to be sovled? check all that applya. an expression because there are variablesb. an expression because it can be simplified by combining like terms. c.an expression because without knowing the value of x or y, it cannot be solved. d. an expression because it does not contain an equal sign. e.an equation because it cannot be solved by combining all the terms using the correct order of operation. f. in equation because all mathematical sentences can be solved. g. an equation because it has variables.