Weegy: An expression is made up of two or more mathematical terms linked by mathematical operands (e.g. + or - or x or /). An equation is an expression with an "=" sign linking the terms of the left expression to the terms of the right expression. [ It is not possible to solve for a variable in an expression because the variable needs a = sign to equate it to the answer on the right of the = sign. So, an equation containing a variable can be ... (More)