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Expression a group of symbols that make a mathematical statement EX: (3x4)+2k Variable a symbol that is used in mathematical or logical expressions to represent a variable quantity EX: j Terms the parts of an expression that are added together EX: 3y+7 Constant A value that does not change EX: 2x+8+x+3y Coefficient A number multiplied by a variable in an algebraic expression. EX: 5x, 8y Like Terms Expressions that contain the same variables and can be added together EX: 6n+2n