631005-43578/n=630996
631005-43578/n=630996 -43578/n=630996-631005 -43578/n= -9 n= -9/ -43578 n=1/4842
631005–630996=43578/* 9=43578/* 43578:9=* 4842=* 631005–(43578:4842)=630996