Used to teach elementary algebra. Got very frustrated with a student who kept saying "x = infinity is a solution" for linear equations like "3x - 4 = x + 10". I couldn't show that infinity was not a solution either. Still cut up years later.
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@fesshole
“For simple real number equations, we assume simple real number solutions are required unless explicitly otherwise noted. For the same reason, results where x is a complex number won’t be counted either.”
Also, ∞ is not a number; it’s a concept. But this is a subset of the answer above.
(p.s. it’s 7, for anyone non mathematical who is wondering.)
@fesshole This really isn't hard.
(3x-4)=(x-10),
(2x-14)=0,
(x-7)=0, x=7
∞-7 ≠ 0