Command Simplify Expression 
- A sum that comprises 2 terms. The 1st term of the sum is equal to a rational expression: the top of the rational expression is seven. The bottom of the rational expression is a product that comprises 2 factors. The 1st factor of the product is nine. The 2nd factor of the product is a power. The base is z. The exponent is three. The 2nd term of the sum is a fraction: the top of the fraction is one. The bottom of the fraction is a product that consists of 2 factors. The 1st factor of the product is equal to twenty one. The 2nd factor of the product is a power. The base is z. The exponent is two.
- seven over nine times z raised to the power of three plus one fraction line twenty one times z to the power two;
Result
- A fraction: the numerator of the fraction is a sum containing 2 terms; the 1st term of the sum is a product containing 2 factors; the 1st factor of the product is equal to three; the 2nd factor of the product is equal to z; the 2nd term of the sum is equal to forty nine; the denominator of the fraction is a product that comprises 2 factors; the 1st factor of the product is sixty three; the 2nd factor of the product is equal to a power; the base is z; the exponent is three;
- three times z plus forty nine fraction line sixty three multiplied by z to the power of three;
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