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Arithmetic expressions can contain one operator, but they also can contain no operators or more than one operator:
6 /* Constant expression */ x /* Variable expression */ 6 + 3 + 2 /* Produces 11 */ 6 - 3 - 2 /* Produces 1 */ 6 * 3 * 2 /* Produces 36 */ 6 / 3 / 2 /* Produces 1 */