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If '÷' means '-', '-' means '×', '×' means '+' and '+' means '÷', then 72 + 9 × 45 - 5 ÷ 42 - 6 = ____________ After converting the symbols, we get => 72 ÷ 9 + 45 × 5 - 42 × 6 => 8 + 45 × 5 - 42 × 6 => 8+ 225 - 252 => 233 - 252 => (-19)

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