\(\Leftrightarrow\sqrt{3}x+2\sqrt{3}x=\sqrt{27}\)
\(\Leftrightarrow3x\sqrt{3}=\sqrt{27}\)
\(\Leftrightarrow x=1\)
\(\sqrt{3x}+\sqrt{12x}=\sqrt{27}\)
\(\Leftrightarrow\sqrt{3x}+\sqrt{2^2.3x}=3\sqrt{3}\)
\(\Leftrightarrow\left(2+1\right)\sqrt{3x}=3\sqrt{3}\)
\(\Leftrightarrow3\sqrt{3x}=3\sqrt{3}\)
`<=> x = 1`