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(x^2*(21 + 2*x))/6


Integrate[7*x + x^2, x] ==
(x^2*(21 + 2*x))/6



                 2
Integrate[7 x + x , x] == 

 2
x  (21 + 2 x)
-------------
      6

Time to compute: < 0.01 second

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