First: You are gien that French fries = freedom fries, in that various food chains and Capital Hill itself have change dthe name of their fried potato products from French fries to freedom fries without actually changing the quality or quantity of the product itself.

Second: French + fries = French fries
freedom + fries = freedom fries
by reason of the word addition postulate.

Third: French + fries = freedom + fries, by means of substitution

Fourth: French = Freedom by means of subtraction