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y in (-oo:+oo)
y-6+73 = 739927*(68-64*y)+829/6779-645 // - 739927*(68-64*y)+829/6779-645
y-(739927*(68-64*y))-(829/6779)-6+73+645 = 0
y-739927*(68-64*y)-829/6779-6+73+645 = 0
(-739927*6779*(68-64*y))/6779+(6779*y)/6779-829/6779+(-6*6779)/6779+(73*6779)/6779+(645*6779)/6779 = 0
6779*y-739927*6779*(68-64*y)-6*6779+73*6779+645*6779-829 = 0
321021775291*y-341085629044-40674-829+494867+4372455 = 0
321021775291*y-341085629873-40674+494867+4372455 = 0
321021775291*y-341085670547+494867+4372455 = 0
321021775291*y-341085175680+4372455 = 0
321021775291*y-341080803225 = 0
(321021775291*y-341080803225)/6779 = 0
(321021775291*y-341080803225)/6779 = 0 // * 6779
321021775291*y-341080803225 = 0
321021775291*y-341080803225 = 0 // + 341080803225
321021775291*y = 341080803225 // : 321021775291
y = 341080803225/321021775291
y = 341080803225/321021775291
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