Roots and solutions

Algebra Level 2

If \(p, q, r\) are the roots of the equation

\({ x }^{ 3 }-{ 7x }^{ 2 }+3x+1=0\)

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

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