Det = a1*b2*c3+b1*c2*a3+c1*a2*b3-a3*b2*c1-b3*c2*a1-c3*a2*b1
da = y1*b2*c3+b1*c2*y3+c1*y2*b3-y3*b2*c1-b3*c2*y1-c3*y2*b1
db = a1*y2*c3+y1*c2*a3+c1*a2*y3-a3*y2*c1-y3*c2*a1-c3*a2*y1
dc = a1*b2*y3+b1*y2*a3+y1*a2*b3-a3*b2*y1-b3*y2*a1-y3*a2*b1
a = da / Det , b = db / Det , c = dc / Det
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