Luca Pacioli

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But of number, cosa [unknown], and cubo [cube of the unknown], however they are compounded ..., nobody until now has formed general rules, because they are not proportional among them ... And therefore, until now, for their equations, one cannot give general rules except that, sometimes, by trial, ... in some particular cases. And therefore when in your equations you find terms with different intervals without proportion, you shall say that the art, until now, has not given the solutions to this case ... even if the case may be possible.