Roots and solutions

Algebra Level 2

If p,q,rp, q, r are the roots of the equation

x37x2+3x+1=0{ x }^{ 3 }-{ 7x }^{ 2 }+3x+1=0

If 1p+1q+1r=M\frac { 1 }{ p } +\frac { 1 }{ q } +\frac { 1 }{ r } = -M, what is the value of MM ?

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