If 'P' denote '÷', 'θ' denotes 'x', 'R' denotes '+' and 'S' denotes '-', what is the value of ' 18 θ 12 P 4 R 5 S 6 '.
18θ12P4R5S6 = 18×12÷4+5-6 => 18×3+5-6 =>54+5-6 = 53
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