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