Sorry, I am new here. Equation is attached here. I have to solve this equation for L. Thanks.

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Sorry, I am new here. Sorry once again. My whole equation is attached here in a mathematica file, and an example is given as

x^2(4pqr + 3nr - ......) - Sqrt[64 x a^8 e^2 M^6 Q^2 r^8 - 128 x^2 a^7 e G L M^6 Q r^7]+ x(5lm + n/q -q/m .......) + Sqrt[ x a e M^4 Q^2 r^8 - 55 x^2 a^7 e G L M^6 Q r^7]........................

A number of under root expressions containing x, x^2 etc too. So please help. So sugest me any to solve my equation. Thanks a lot,

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You have not given any indication of what you have tried. You have not even given a clear description of what it is you want.

Rules of thumb for posting questions: Be clear. Give examples., Provide whatever code you have tried. Don't make people guess as to what it is that's being asked.

These show up in a simple web search.

https://reference.wolfram.com/language/tutorial/SolvingEquations.html

https://reference.wolfram.com/language/guide/EquationSolving.html

https://reference.wolfram.com/language/tutorial/SimultaneousEquations.html

https://reference.wolfram.com/language/tutorial/ComplexPolynomialSystems.html

https://reference.wolfram.com/language/tutorial/ComplexPolynomialSystems.html