\[\left( x^{4} \cdot x^{3} \right)\ :\left( x^{3} \cdot x^{2} \right) =\]
\[= x^{4 + 3}\ :x^{3 + 2} = x^{7}\ :x^{5} =\]
\[= x^{7 - 5} = x^{2}.\ \]