Differential Equations/Homogenous 3

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1)3y+18y81y=0

2)y+6y+13y=0

3)y+10y+25y=0

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

5)y2y15y+36y=0

6)y+5y4y20y=0

7)y+4y+y26y=0