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A circle with center in the first quadra...

A circle with center in the first quadrant is tangent to `y = x+10, y = x - 6`, and the `y- a x is`. Let `(h, k)` be the center of the circle. If the value of `(h + k) = a + b sqrta` where `sqrta` is a surd, find the value of `a +b`.

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