If '+' means '÷'; '÷' means '–'; '–'means '×' and '×' means '+', then 10 ÷ 2 – 15 + 3 × 5 = ?

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If '+' means '÷'; '÷' means '–'; '–'means '×' and '×' means '+', then 10 ÷ 2 – 15 + 3 × 5 = ?