In what ways was the mexican revolution similar to the american revolution

The similarities in the Mexican and American Revolutions can be seen in several things. One of the things was gaining an independence from the motherland that formed them, by over time grew to be more of a burden to their development. Another similarity is that the human rights and the slavery were part of the motives, as well as being able to create their own politics. Both revolutions were waged on their own territories, not on the territories of the motherlands, or on neutral ground. Both revolutions were eventually successful and Mexico and US gained independence from Spain and Britain.

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