Why we always write equation in form(adsbygoogle = window.adsbygoogle || []).push({});

[tex]y''(x)+a(x)y'(x)+b(x)=f(x)[/tex]

Why we never write:

[tex]m(x)y''(x)+a(x)y'(x)+b(x)=f(x)[/tex]

Why we never write coefficient ##m(x)## for example?

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# Coefficients derivative

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