V \( \mathbb{R} \) rieš rovnicu:
\( 7 x(-3 x+6)=8(2-x) \)
\( K=\left\{\frac{8}{21} ; 2\right\} \)
\( K=\left\{\frac{7}{21} ; 2\right\} \)
\( K=\left\{\frac{8}{21} ; 3\right\} \)
\( K=\left\{\frac{8}{20} ; 2\right\} \)