Graphing Tool that allows for Manually entered X axis Points

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I've been looking for ages and either cannot find the tool or figure out how...

I would like to plot a graph with the y=1/5(104-2(x/20+20/x)) but the graph with normal scaling is useless.

Log scaling of just the x axis could work, but what I am really looking for is a way to manually set the progression of the x axis. For instance, I would like to set 0,0, 20,0, and 1000,0, or something along those lines, at fixed intervals.

Does anyone know of a tool that will do this? Thank you!

EDIT: Ideally a Mac-compatible program or web tool. I cannot seem to do it in Numbers, Excel, or Grapher.