What would be an example of formal region

An example of a foreign region would be places that have

Official boundaries such as, countries, states, and cities.

Example: areas include the 'Midwest', and the 'Big Apple' in the US.

1.3x - 2 - (3.3x + 5) = 2x + 1

1.3x - 2 - 3.3x - 5 = 2x + 1

-2x - 7 = 2x + 1

-7 = 4x + 1

-8 = 4x

x = -2

c. troops marched forward in close formation against newer, more accurate weapons