If '+' means 'division', '-' means 'multiplication', '÷' means 'addition' and ' X ' means 'subtraction', then what is the value of the following expression?
15 - 5 ÷ 165 + 5 X 18
15 - 5 ÷ 165 + 5 X 18 15 X 5 + 165 ÷ 5 - 18 15 X 5 + 33 - 18 75 + 33 - 18 = 90
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