13 [4+5 {120/2 (4+8)}]
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=13[4+5{120/2(4+8)}]
=13[9{120/2*12}]
=13[9{60*12}]
=13[9*720]
=13*6480
=84240
=13[9{120/2*12}]
=13[9{60*12}]
=13[9*720]
=13*6480
=84240
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