Heya.
[tex]\huge\boxed{x= 7}[/tex]
[tex]\frac{2}{3}x\ -\ \frac{14}{3}\ =\ \frac{1}{2}\left(21-3x\right) \\\\\frac{2}{3}x\ +\ \frac{-14}{3}\ =\ \frac{-3}{2}x +\frac{21}{2} |+\frac{14}{3} \\\\\frac{13}{6} x = \frac{91}{6} |*\frac{6}{13} \\\\(\frac{6}{13}) *(\frac{13}{6}x) = (\frac{6}{13}) * (\frac{91}{6} )\\\\x = 7[/tex]
Mam nadzieję że pomogłem! ~EnglishElite
