\[\left( \frac{2^{\backslash 2}}{7} + \frac{3}{14} \right)(7,5 - 13,5) =\]
\[= \frac{4 + 3}{14} \cdot ( - 6) = \frac{7}{14} \cdot ( - 6) =\]
\[= \frac{1}{2} \cdot ( - 6) = - 3.\]