The complete set of non-zero values of \( k \) such that the equation \( \left|x^{2}-7 x+6\rig...

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The complete set of non-zero values of \( k \) such that the equation \( \left|x^{2}-7 x+6\right|=k x \) is satisfies by at least one and at most three real values of \( x \) is \( \left(-\infty, \ell_{1}\right] \cup\left[\ell_{2}, \infty\right] \) then \( \frac{\left|\ell_{1}-\ell_{2}\right|}{2} \) is equal to
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