The quadratic equations $x^{2}+5x+8=0$ and $ax^{2}+bx+c=0$ have a common root and $a,b,c,\epsilon N.a$ the minimum value of $\dfrac{a+b+c}{2}$ is equal to
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The quadratic equations $x^{2}+5x+8=0$ and $ax^{2}+bx+c=0$ have a common root and $a,b,c,\epsilon N.a$ the minimum value of $\dfrac{a+b+c}{2}$ is equal to