The coefficient of the quadratic equation \( a x^{2}+(a+d) x+ \) \( (a+2 d)=0 \) are consecutive...

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The coefficient of the quadratic equation \( a x^{2}+(a+d) x+ \) \( (a+2 d)=0 \) are consecutive terms of a positively valued, increasing arithmetic sequence. Then the least integral value of \( \frac{d}{a} \) such that the equation has real solutions is.
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