"The principal object of Algebra, as well as of all the other branches of the Mathematics, is to determine the value of quantities which were before unknown; and this is obtained by considering attentively the conditions given, which are always expressed in known numbers: for which reason Algebra has been defined, The science which teaches how to determine unknown quantities by means of those that are known."
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Leonhard Euler, Elements of Algebra (1770) Vol. 1, taken from English translation (1810) by Charles Taylor(?) p. 270.
https://en.wikiquote.org/wiki/History_of_algebra
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