To find side $ b $ use Thw Law of Sines:
$$ \dfrac{ b } { \sin( \beta ) } = \dfrac{ c } { \sin( \gamma ) } $$After substituting $\beta = 50^o$, $c = 14$ and $\gamma = 105^o$ we have:
$$ \dfrac{ b } { \sin( 50^o ) } = \dfrac{ 14 } { \sin( 105^o ) } $$ $$ \dfrac{ b } { 0.766 } = \dfrac{ 14 } { 0.9659 } $$ $$ b \cdot 0.9659 = 0.766 \cdot 14 $$ $$ b \cdot 0.9659 = 10.7246 $$ $$ b = \dfrac{ 10.7246 }{ 0.9659 } $$ $$ b \approx 11.1029 $$