Question: How do I put an integral with variable upper limit to a system of differential equations?

I need to solve a system of differential-integral equations (see them on the picture). The T(x) function contains an integral with variable upper limit of the wanted function r(x), while the r(x) contains T(x). I don't know how to load the integral into a system, what syntaxix should I use. The boundary conditions and constants are written in the file, as is the error that appears when I try to enter the T(x) function. In the end I need a graphic of r(x) and T(x).


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