Ordinary Differential Equations/Homogenous 3

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1) 3y''+18y'-81y=0

2) y''+6y'+13y=0

3) y''+10y'+25y=0

4) y''''+24y'''+218y''+838y'+1369y=0

5) y'''-2y''-15y'+36y=0

6) y'''+5y''-4y'-20y=0

7) y'''+4y''+y'-26y=0