title: How to use With inside a ContourPlot in mathematica?
body: <p>I want to use something like:</p>
  
  <p>ContourPlot [Abs[z-1] == 2]</p>
  
  <p>and to define z as being = x + iy</p>
  
  <p>I saw somewhere an example like that with the With function, but I can't find it anymore and all my tries are not being successful.</p>