I need help on this -3x-x-3x3 =? It’s kinda confusing me and I’ve been on this question for awhile

The domestic variety is cheaper because there is no import duties or no charges imposed on it because of the import from other countries.

Explanation:

A country produces a lot of goods and services in it's own economy using the resources which are present in it's own country. But the goods and the services that are not available in the country but are demanded by the citizens of the country are imported from other countries.

When these goods and services are imported from other countries then there is an imposition of duties or taxes on those goods making the charges of those goods high. With the transportation of the goods from one country to the other, then also some cost is imposed on the good. This increases the cost or the price of the good.