\(\left(\frac{3}{5}\right)^5\times x=\left(\frac{3}{7}\right)^7\) \(\left(-\frac{1}{3}\right)^3\times x=\frac{1}{81}\)
\(\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\) \(\left(x+\frac{1}{2}\right)^4=\frac{16}{81}\)