\[5x^{\backslash 6x} + \frac{7y - 30x^{2}}{6x} =\]
\[= \frac{30x^{2} + 7y - 30x^{2}}{6x} = \frac{7y}{6x};\]
\[x = - \frac{7}{3};\ \ y = 15:\]
\[\frac{7 \cdot 15}{6 \cdot \left( - \frac{7}{3} \right)} = \frac{7 \cdot 15}{- 2 \cdot 7} = - \frac{15}{2} = - 7,5.\]