Question: omit constants of an equation to obtain its diffrential equation

I want to find the diffrential equation of

where a , b and c are constants. I know that we have to diffrentiate 3 times (number of constants) with respect to x to omit the constants and find the diffential equation.

 in other words tThe difrential equation should be independent of all 3 constants and the result is third order difrential equation without any constants.



please help me,  thanks for your attention in advance

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