# Finding the points of intersection

Geometry Level pending

Find the points of intersection of the circles $$x^2 + y^2 - 18x - 4y + 35 = 0$$ and $$x^2 + y^2 + 2x + 6y -15 = 0$$.

If your answer is $$(a,b)$$ and $$(c,d)$$, give your answer as $$a+b+c+d$$.

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