The standard form of a circle's equation is $(x-h)^2 + (y-k)^2 = r^2$, where $(h,k)$ is the center of the circle and $r$ is the radius.
The given equation is $x^{2}+y^{2}+8 x-6 y-15=0$. We can rewrite this by grouping the $x$ terms together and the $y$ terms
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