What term was applied to the peaceful separation of czechoslovakia into two separate nations?

The Velvet Divorce is the name given to the dissolution of Czechoslovakia into two separate countries, the Czech Republic and Slovakia, which went into effect on 1 January 1993. The name Velvet Divorce references the Velvet Revolution of 1989, which led to the end of Communist rule in Czechoslovakia.---History, Politics & Society

the ss was the main organization responsible for the genocidal murder of around six million people of european ethnic minorities, essentially jews, in the holocaust. the members of all its branches committed war crimes and crimes against humanity during the second world war (1939-1945). likewise, the ss were involved in commercial enterprises and exploited the inmates of the concentration camps as slave laborers.

the tortures and assassinations committed by the ss were the result of an ideology developed long before the armed conflict, this ideology was based on the racial supremacy of the germans over the rest.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69