tìm x
\(\sqrt{9\left(x-1\right)}=21\)
\(\sqrt{4\left(x-1\right)^2}-6=0\)
\(\sqrt{\left(x-5\right)^2}=8\)

\(\sqrt{\left(2x-1\right)^2}=3\)

\(\sqrt{\left(2x+3\right)^2}=3\)

\(\sqrt{x^2-4x+4}=2x-3\)

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