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[Commentary:
This page refers to Stevin's L'arithmétique ... aussi l'algebre
(Stevin , page 306. There Stevin solves the equation 1(3) = 6(1) + 40 (in modern notation ), leading to the cube roots writen down by Harriot at the top of the page. ]
√C.20 + √392 + √C.20 – √392. Stevin pag.