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$\large { x }^{ 6 }-12{ x }^{ 5 }+a{ x }^{ 4 }+b{ x }^{ 3 }+c{ x }^{ 2 }+dx+64 =0$

Let $a,b,c,d$ be all constants.

If all of the roots of the above equation are positive, find $b + c - a$.

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