Intersection of 2 graphs

Algebra Level 2

The two graphs y=x2+4x+1y = x^2 +4x+1 and y=3x+9y = -3x+9 intersect at two points: (a,b)(a,b) and (c,d)(c,d). Find the value of a+b+c+d.a+b+c+d.

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