If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
648 - 9 + 118 X 15 ÷ 12 + 780 - 12
648 - 9 + 118 X 15 ÷ 12 + 780 - 12 648 ÷ 9 - 118 + 15 X 12 - 780 ÷ 12 72 - 118 + 180 - 65 252 - 183 = 69
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