If the mathematical operator ' /' means '* ', '+' means '—',' *' means '+' and '—' means '/ ', then 25 + 18 — 3 *7 + 3 =
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25+18-3*7+3
= 25-18/3+7-3........(Substituted the signs)
= 25-6+7-3
= 25+7-6-3
= 32-9
= 23
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