Problem with DSolve in Mathematica to solve PDEs

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I was using DSolve in Mathematica to solve PDEs as follows:

DSolve[{4 (-5 + 8 v) Ur[r] + 6 (-3 + 4 v) U\\[Phi][r] == 2 r (4 (-1 + v) Derivative[1][Ur][r] +


                      
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