| CommandJoin fractions Expression
  
 A sum consisting of 2 terms.  The first  term of the sum  is equal to  a rational expression: the top of the rational expression is a sum that comprises 2 terms.  The first  term of the sum  is equal to  a product comprising 2 factors.  The first  factor of the product  is  three.   The second  factor of the product  is  x.  The second  term of the sum  is equal to  four.   The bottom of the rational expression is a sum consisting of 2 terms.  The first  term of the sum  is equal to  x.  The second  term of the sum  is equal to   negative seven.   The second  term of the sum  is   a negative fraction: the numerator of the fraction is a sum that comprises 2 terms.  The first  term of the sum  is equal to  x.  The second  term of the sum  is   negative four.   The denominator of the fraction is a sum that comprises 3 terms.  The first  term of the  sum  is  a power .  The base is x.  The exponent is two.   The second  term of the sum  is equal to   a negative product that contains 2 factors.  The first  factor of the product  is equal to  fifteen.   The second  factor of the product  is  x.  The third  term of the sum  is  fifty six.three  times x plus four  over x plus  negative seven  plus  negative x plus  negative four  over x to the power two  plus  negative fifteen  multiplied by x plus fifty six;
 Result
  
 A quotient: dividend of the quotient is a sum that contains 3 terms.  The first  term of the sum  is  a product that comprises 2 factors.  The first  factor of the product  is equal to  three.   The second  factor of the product  is equal to  a power.  The base is x.  The exponent is two.   The second  term of the sum  is equal to   a negative product of 2 factors.  The first  factor of the product  is equal to  twenty one.   The second  factor of the product  is equal to  x.  The third  term of the sum  is   negative twenty eight.   Divisor of the quotient is a product consisting of 2 factors.  The first  factor of the product  is equal to  a sum comprising 2 terms.  The first  term of the sum  is  x.  The second  term of the sum  is equal to   negative eight.   The second  factor of the product  is equal to  a sum that comprises 2 terms.  The first  term of the sum  is  x.  The second  term of the sum  is   negative seven.three  times x to the power two  plus  negative twenty one  multiplied by x plus  negative twenty eight  fraction line opening parenthesis x plus  negative eight  closing parenthesis multiplied by left parenthesis x plus  negative seven  right parenthesis;
 
 
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