Urči kořeny rovnice:
\( \binom{7}{x}+\binom{7}{3+x}=42 \)
\( x_{1}=1, x_{2}=2 \)
\( x_{1}=2, x_{2}=4 \)
\( x_{1}=3, x_{2}=5 \)
\( x_{1}=0, x_{2}=3 \)
