What does this process say about our government when compared to other countries systems of government?

Americans are generally positive about the way democracy is working in the United States. Yet a majority also says that the “fundamental design and structure” of U.S. government is in need of “significant changes” to make it work today.Republicans are more likely than Democrats to say U.S. democracy is working at least somewhat well, and less likely to say government is in need of sweeping changes. And far more Republicans than Democrats say the U.S. political system is “best in the world” or “above average” when compared with political systems of other developed nations.

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