\(A=\dfrac{2}{\sqrt{x}-5}-\dfrac{2}{\sqrt{x}+5}+\dfrac{10\sqrt{x}}{x-5}\)
\(=\dfrac{2\sqrt{x}+10-2\sqrt{x}+10}{x-25}+\dfrac{10\sqrt{x}}{x-5}\)
\(=\dfrac{20}{x-25}+\dfrac{10\sqrt{x}}{x-5}=\dfrac{20x-100+10x\sqrt{x}-250\sqrt{x}}{\left(x-25\right)\left(x-5\right)}\)
\(=\dfrac{20x-100+10x\sqrt{x}-250\sqrt{x}}{\left(x-25\right)\left(x-5\right)}\)