Question: circle question

Lets say I have a circle with the eqn 

x^2 + y^2 - 10*x - 75 = 0

Is there a command which would allow me to convert the above to (x-5)^2+y^2=100 ? 

I have tried to both collect, factor but neither of these work for obvious reason. 

So any idea/surgestion on which command one could use? 

Many thanks in advance.  

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