A mathematics "treatise" written by a crank called The Ridiculous Oversight, or some nonsense. I think he was trying to justify dividing by 0.
Edit: I found it in my library's catalogue
Title: The stupid ridiculous oversight / by Lloyd Collester Jones.
Edition: 1st ed.
Publisher: [Iowa City] : Jones, 1978.
Description: 274 p. ; 29 cm.
LC Subject Heading(s): Differential equations --Numerical solutions.
No, the author wasn't trying to justify dividing by zero, he merrily divided by 0 in every line of that unsourced, unformatted, unproofed high-school algebra number vomit.
Wtf?
Oh, also, "some crank called The Ridiculous Oversight" reads funny.
And welcome back!