If '+' means '-', '×' means '+', '-' means '÷', and '÷' means '×', then what is the value of the expression ' 100 - 10 + 30 × 5 ÷ 2 × 10' ?
' 100 - 10 + 30 × 5 ÷ 2 × 10' 100 ÷ 10 - 30 + 5 × 2 + 10 = 10 - 30 + 10 + 10 = 0
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