Verified Answer :

This involvea factoring the polynomial into binomials and solving.
So make it (3x+1)(x-7)
X equals 7 and -1/3

httplyiah

3x^2-20x-7=0

9x-20x-7=0

-11x-7=0
       -7   -7
      _______
        -11x  0
         _____
          11   11 


 your answer is 0

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