\(\frac{x^2}{-5}\)\(=\) \(\frac{25}{x}\)

\(x^2\)\(\times\)\(x\)\(=\)   \(25\)\(\times\)\(\left(-5\right)\)

\(x\) \(\times\)\(x\)\(\times\)\(x\)\(=\)  \(-125\)

\(x^3\)\(=\)\(-125\)

\(x^3\)\(=\)\(-5^3\)

\(\Rightarrow\)\(x\)\(=\)\(-5\)

ban tu lam that ha