7. (D+ 3)'y = 15x'e-3* 8. (D- 4)'y 15x²e**. 9. D (D – 2)²y = 16e2 10. D2(D + 3)²y = 9e-3x 11. (D² – D- 2)y = 18xe 12. (D2 - D- 2)y = 36xe2". %3D %3D %3D %3D UR %3D %3D

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