c) 2 + 19/5 chia (3x) = 11/3 ;

c) $2+\frac{19}{5}:\left(3x\right)=\frac{11}{3}$

$\frac{19}{5}:\left(3x\right)=\frac{11}{3}-2$

$\frac{19}{5}:\left(3x\right)=\frac{11}{3}-\frac{6}{3}$

$\frac{19}{5}:\left(3x\right)=\frac{5}{3}$

$3x=\frac{19}{5}:\frac{5}{3}$

$3x=\frac{19}{5}.\frac{3}{5}$

$3x=\frac{57}{25}$

$x=\frac{57}{25}:3$

$x=\frac{57}{25}.\frac{1}{3}$

$x=\frac{19}{25}$

Vậy $x=\frac{19}{25}$.