| CommandSimplify 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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