Simplify the exponential expression. $$ \left(\frac{-35 a^{5} b^{7}}{7 a^{7} b^{-2}}\right)^{3} $$ $$ \left(\frac{-35 a^{5} b^{7}}{7 a^{7} b^{-2}}\right)^{3}=\square $$ (Simplify your answer. Use positive exponents only.)

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Calculate or simplify the expression $$ \left(\frac{-35 a^{5} b^{7}}{7 a^{7} b^{-2}}\right)^{3} $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(\frac{-35a^{5}b^{7}}{7a^{7}b^{-2}}\right)^{3}$$
- step1: Reduce the fraction:
  $$\left(-\frac{5b^{9}}{a^{2}}\right)^{3}$$
- step2: Rewrite the expression:
  $$\frac{\left(-5b^{9}\right)^{3}}{\left(a^{2}\right)^{3}}$$
- step3: Evaluate the power:
  $$\frac{-125b^{27}}{a^{6}}$$
- step4: Rewrite the fraction:
  $$-\frac{125b^{27}}{a^{6}}$$
The simplified form of the exponential expression $$ \left(\frac{-35 a^{5} b^{7}}{7 a^{7} b^{-2}}\right)^{3} $$ is $$ -\frac{125b^{27}}{a^{6}} $$.
$$ -\frac{125b^{27}}{a^{6}} $$

Simplify the exponential expression.

(Simplify your answer. Use positive exponents only.)

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Simplify the exponential expression. (Simplify your answer. Use positive exponents only.)