Summarize the war that made American episode 1?

The dramatic documentary tells the story of the French and Indian War (1754-1763), which began in the wilderness of the Pennsylvania frontier and spread throughout the colonies, into Canada, and ultimately around the world.

Explanation:

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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