(457+896x456)/(457x896-439) =(457+896*456)/(456*896+896-439) =(457+896*456)/(457+896*456

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(457+896x456)/(457x896-439) =(457+896*456)/(456*896+896-439) =(457+896*456)/(457+896*456
(457+896x456)/(457x896-439) =(457+896*456)/(456*896+896-439) =(457+896*456)/(457+896*456

(457+896x456)/(457x896-439) =(457+896*456)/(456*896+896-439) =(457+896*456)/(457+896*456
(457+896x456)/(457x896-439)
=(457+896x456)/[(456+1)x896-439]
=(457+896x456)/(456x896+896-439)
=(457+896x456)/(456x896+457)
=1