@Felthry ...oh wow - apparently this variation dates back to the 1540s https://www.etymonline.com/word/substract#etymonline_v_38668
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@packbat actually if you read the etymology it may be older, it cites a modern latin variation "substrahere" of the standard "subtrahere"
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@Felthry oh, right right
but yeah, like, substract has been a thing forever! that's so cool!
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