\[5x^{2}y^{3} = - 7\]
\[x^{2}y^{3} = - \frac{7}{5}\]
\[- 10x^{2}y^{3} = - 2 \cdot 5x^{2}y^{3} =\]
\[= - 2 \cdot ( - 7) = 14.\]