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## Homework Statement

u'''-8u''+2u'-3u=0

## Homework Equations

## The Attempt at a Solution

So I let:

x1 = u

then x1' = u'

x2 = u'

then x1' = x2

and x2' = u''

x3 = u''

then x2' = x3

and x3' = u'''

I have only done these problems with second order equations, so I don't understand which values I am supposed to plug back into the original equation. Any help is appreciated! Thanks!