The official name of East Germany was the German Democratic Republic. It was a communist state aligned in the orbit of the Soviet Union.
The Allies of World War II divided Germany into four zones of control after the war -- each zone occupied by one of the Allied nations -- Britain, France, the USA, and the USSR. The same thing was done for the city of Berlin, which was in the Soviet-controlled zone (East Germany). East Berlin was governed under Soviet control, and West Berlin was governed by the western Allies -- Britain, France and the USA. The British, French and American sectors were combined into West Germany (and West Berlin), and the eastern area became "East Germany," a satellite of the Soviet Union.
A constant term in an expression is a term that does is independent of any variables. This means that constant term will have non of the variables attached to them. In the expression we notice that the terms integers 4 and 5 are the only terms that are not coefficients of any of the variables in the expression.
