Meaning of EQUATION in English
n. 25B6; noun
a quadratic equation : MATHEMATICAL PROBLEM, sum, calculation, question.
the equation of success with riches : IDENTIFICATION, association, connection, matching; equivalence, correspondence, agreement, comparison.
other factors came into the equation : SITUATION, problem, case, question; quandary, predicament.
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012