ĐKXĐ: ...
\(\Leftrightarrow x^2\left(\sqrt{x+3}-2\right)+2020\left(x-1\right)=0\)
\(\Leftrightarrow\frac{x^2\left(x-1\right)}{\sqrt{x+3}+2}+2020\left(x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(\frac{x^2}{\sqrt{x+3}+2}+2020\right)=0\)
\(\Leftrightarrow x-1=0\Rightarrow x=1\)